Some cars are dealer only, some aren't. Some are totaled with salvage titles, some are not. All that information is on the web-page with the car listed. Don't buy it without seeing it in person and expect it to be exactly as described or better. It will almost always be worse. Don't spend more on a car than you're willing to loose. I'm a car dealer and have to say that they are the biggest pain in the ass auction company to get setup with out of any auction company that I deal with. I've had no good experiences with them, but a friend of mine has.
2 weeks ago my brothers coworkers car was totaled. Insurance had it immediately towed away. I found out "totaled" meant her 2003 Camry with 120k needed a new hood and a headlight because somebody backed into her in a parking lot. I had her buy it back from insurance so that I could fix and resell. Car had already been towed to copart. I go as the "owners agent" to pick up the car that is still technically owned by her, not copart or the insurance. It's sitting in the first row inside the fence, I can see it as I'm stuck waiting 55 minutes for them to get one of their yard idiots to drive it out because they wouldn't let me walk in and drive the car 50ft out of the gate. It's the lowest of the low people buying there and also working there, and nobody seems to give a fuck about anything.