I understand that but like Cowboy said, at least get one that no one else is going for. I'm poor so buying out isn't an option most of the time and sometimes there are plenty of cars available. The other reason which I'll put into spoilers:

Say I'm going for a Honda Civic and there are 10 to choose from. Six are modified with four stock ones like so

1. Mod

2. Mod

3. Mod

4. Stock

5. Stock

6. Mod

7. Stock

8. Mod

9. Stock

10. Mod

Like I said I'll choose a stock example hoping the modified cars will draw attention away from mine so we'll go with number 7. Here's where I don't get the auction house: All those other cars have no bids on them, yet someone will go straight for 7 and bid with me or buy it out. I'll usually go back and check, and sure enough, the other ones listed are still there. That's what I want to know. Why? Why go for mine when there are other examples right there that have no bids, are the same price, with even modified or stock ones to choose from? Try bidding on a car just for the experience and you'll probably get what I mean.