1. Most of the cars I want to sell, I can't. 2. I can't sell specialty dealer cars for a penny of profit 3. Adding paint somehow makes a car worth millions 4. You can't search for, and presumably cannot buy any locked cars in the game. Considering the level up rewards system, I'm not sure I see much of a point to this auction house. All I can do is buy cars that I can already buy. Even if it's "cheap" it's more expensive than getting one on a level up reward. I guess it's for buying/selling designs, for millions of credits, that can either be had for free, or have something similar for free?