The desk produces one number and shows its work. A live lot is checked against two independent market-value sources, against what your own store has actually sold, and against the cars already on your lot — so you are not bidding on the third example of a nameplate you are long on and aging. Drag the reconditioning estimate and the maximum bid moves with it, because the ceiling exists to protect a gross, not to flatter a purchase.
It also works before the lane opens. Your own sales history separates what customers are asking for from what you are already carrying, ranks the gaps by how fast each one really moves, and ties them to lots running right now. And when the car is not at auction at all — a trade standing in your drive, a private lot, a unit somebody offered you at the counter — a VIN and a mileage run the same engine on demand.
What it refuses to do is bid. There is no auto-buy, no bot in the lane, and no recommendation that commits money on its own. GhostBuy hands your buyer a defended ceiling and the gross behind it; the decision to go one more time stays where it belongs, with the person standing in the lane. The difference is that afterwards, the number they bid to is on the record and can be argued with.