I haven't sold on BaT but I've read some seller comments that the process is somewhat out of your hands. One seller stated that his auction wasn't supposed to start for X days, and he was still working on getting pics made when BaT ran it days early. Apparently he couldn't stop them.
I will say, it sure looks like they get top dollar for a lot of cars, so maybe the $ justifies the potential negatives.
I also note that they seem to try to schedule the highest $ car each day to go first, and they seem to always have at least 2 or 3 $100K+ cars each day, so that would seem to require some forceful scheduling on their part that may not correspond to what every seller wants.