By Tim Harris · April 1, 2026
“Where horsepower meets conversation”
📍 Three Stories. One Bigger Shift in the Car World.
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“Dealers trading with each other and calling it a market… is not a market.”
There are moments when a market stops behaving like a market.
Not crashing.
Not booming.
Just… drifting away from reality.
The Porsche GT market may be entering one of those moments.
And the most serious challenge to how that market works isn’t coming from Wall Street, Porsche AG, or a regulator.
It’s coming from a forum post.
🧠 The Post That Hit a Nerve
Buried inside a long-running thread on Rennlist—a place better known for tire debates and spec sheets—user chicagomarketing published something different.
Not an opinion.
An investigation.
Over several weeks, he built a dataset tracking Porsche GT car sales—primarily 992-generation GT3s—using a method most enthusiasts never attempt:
“VINs don’t lie. It is a unique 17-digit serial number we can trace throughout the system.”
He scraped sales data from Bring a Trailer (BaT), then followed those same cars across:
Dealer inventory systems
Marketplace listings
CARFAX reports
Registration records
Secondary resale platforms
What he claims to have found has quietly unsettled one of the most trusted pricing signals in the enthusiast world.
🔍 The Claim
It’s not that BaT is fake.
It’s something more subtle—and more consequential.
“BaT is the laundromat in the middle that turns dealer-to-dealer flips into ‘market comps.’”
In other words:
The platform isn’t the problem.
But the participants—and how they use it—might be shaping the outcome.
🔁 A Different Kind of Market
According to his dataset of roughly 130 Porsche GT transactions:
“73% of BaT GT3 transactions had a dealer or dealer-linked account on at least one side.”
“Almost a third were dealer-to-dealer with no consumer involved at all.”
That reframes everything.
Because BaT has become more than a marketplace. It’s a reference point:
Dealers cite it
Buyers trust it
Indexes track it
Forums repeat it
It has become, for many, the market itself
But what if the market it reflects… isn’t purely consumer-driven?
🧩 The Mechanics of “Comp Washing”
Chicagomarketing introduces a concept worth understanding:
“Comp washing”
The alleged process works like this:
A Porsche GT allocation originates at a franchise dealer
The car moves—often quickly—through an intermediary or independent consigner
It appears on BaT as a public auction
A buyer—sometimes a dealer-linked account—wins the auction
The result becomes a public comp
The same or similar cars reappear as dealer inventory at higher prices
And now the key point:
“You’ve got a $384k ‘market comp’… and neither party was a retail customer.”
🧾 The Car That Didn’t Move
One example stands out.
A GT3 Touring:
Sold on BaT for $384,000
Buyer account created the same month
Titled roughly 90 miles from the allocating dealer
Still showing 14 miles months later
Ownership trail:
Franchise dealer
Corporate entity
Out-of-state registration
Consignment seller
Auction buyer
“Five entities touched this car and it gained one mile.”
It’s a detail that doesn’t prove wrongdoing.
But it does raise a question:
Was this a sale… or a transaction?
🏢 The Invisible Sell Side
One of the more revealing findings:
“47% of sales are from dealers… but not a single Porsche franchise dealer is selling on BaT.”
Instead, the listings are dominated by independent consigners and brokers.
That matters.
Because Porsche tightly controls how franchise dealers handle high-demand GT allocations.
So the cars move.
Laterally.
Quietly.
By the time they surface publicly, the original source is gone.
💰 Follow the Spread
The investigation doesn’t stop at the sale.
It follows the car.
One buyer account reportedly purchased five GT cars for $1.56M total.
Those same cars:
Reappeared on dealer lots
Listed for roughly $1.74M combined
Representing ~$184,000 in markup
Elsewhere, specific VINs moved:
From BaT purchase
To franchise dealer inventory
To Porsche Certified Pre-Owned (CPO) listings
At higher prices
The pattern is consistent:
BaT price → Dealer inventory → Higher retail price
⚖️ The Debate That Followed
On Rennlist, the response to chicagomarketing’s post was immediate—and divided.
Some saw confirmation of what they suspected:
Increasing inventory
Rising CPO listings
Short holding periods
Others pushed back hard:
“Find one at MSRP. You can’t.”
And a third group dismissed the entire premise:
This is just the market.
Supply. Demand. Wealthy buyers doing what they’ve always done.
🧠 What Actually Holds Up
Strip away the noise, and a few things are clearly true:
1. Dealer participation is high
This is not controversial. The data—and the market—support it.
2. BaT influences pricing
Also not controversial. It is one of the most visible comp-setting platforms in the world.
3. The market is not purely retail-driven
This is the key shift. And it matters.
⚠️ Where the Argument Stretches
But there are limits to what the data proves.
Chicagomarketing shows:
Patterns
Repeated behaviors
Financial incentives
What he does not conclusively prove:
Coordinated manipulation
Intentional price engineering across actors
A unified system acting in concert
That distinction matters.
Because:
A dealer-heavy market is not the same as a manipulated one.
🧨 The Real Insight
This is the part most people miss.
Even if nothing illegal is happening…
Even if every transaction is technically legitimate…
The structure alone changes the outcome.
Because:
A market dominated by insiders behaves differently than one driven by end users.
Prices may still be real.
But they may not mean what you think they mean.
🏁 Final Word
Chicagomarketing may not have proven a conspiracy.
But he has exposed something more important:
A shift.
From a market driven by drivers…
To a market influenced by inventory, intermediaries, and capital.
And once you see that, you can’t unsee it.
🎯 What You Should Do With This
Next time you see a BaT result, don’t just ask:
“What did it sell for?”
Ask:
“Who was on each side of that transaction?”
Because in this market…
That’s the difference between price…
And truth.
— Tim Harris
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