Dealers love trades? Good one! Yes, if it's nearly new, has almost no kilometers on it, and you're willing to let it go for $3-5K less than retail. Otherwise, they prefer to buy all their used cars wholesale at auctions.
1. Nearly new cars are almost unknown as trades because the owners are often too far upside down to make the deal. The last thing a salesman wants to hear is, "I want to trade my 2008 XYZ, I just bought it 6 months ago."
2. $3-5K less than retail? Well duh. It would be a pretty silly business that bought products at a price they can't profit from. Here's a tip: dealers pay less than retail at the auction too. And more than likely they can get one from the auction just like your like-new trade for thousands less than you think it's worth.
3. Prefer to buy at auctions? Auctions are super easy to buy from especially now that they are online. Click, click, click and before you know it you've spent $500,000. However, as I wrote earlier, there is basically nothing earlier than 2007s going through dealer auctions now. Used car lots with nothing but 2007 and newer vehicles generally can't do much volume, or make much profit. How can a dealer expect to make much profit from a one year old ex-rental when virtually the exact same car is for sale at every other dealer? The auctions that sell cars older than 2007s are avoided by franchised dealers (except to sell at) for the same reason that people have been warned off them here - because they are full of junk.