Reddevil, the difference between you and the classified trolls is that you actually read through the forum. Don't be offended at the fact that sellers with low post count are high offenders, that's just the way it usually works out.
The classified trolls don't care about anything but volume, and only read the classified subforums. You can tell because they piggy back onto other people's for sale threads, and immediately jump in on WTB ads with a list of what they have (that often isn't really what the person is asking for).
I've been a member of other boards where a specific template was made to sell vehicles, then, if you don't fill out the template, your thread is deleted. That's a decent idea, but it is on the line of causing a rift between the staff and the posters. Most people hop on board just fine, but you'll never, ever, capture the classified trolls because they only post to sell and will never read any instructions or rants or anything.
EDIT: I'm largely in agreement with Zund. Post bad ads and people won't read them. I also like to window shop and read a good amount of for sale ads. There are a few posters who I've seen around enough that I just don't bother with their ads for various reasons. The worst guy actually doesn't post up ads here anymore after he burned some bridges with his bad attitude and couldn't sell his wares.