Are they a good buy on most occasions? how much does the price usually go up from the beggining price. for instance, how much up will a 2005 Mini Cooper go if its started at $500? Are they trustworthy? Any one with experience?Do theynhave any sort of rules or regulations for selling them? like they can't be used by someone under 21, or you can't purchase them unless you're 18. Any other rules like that?

Take a good mechanic with you to check out what you want to buy

YES AND NO...................BUT AS STATED ABOVE YOU MUST TAKE A CERTIFIED MECHANIC WITH YOU AND NOT JUST SOME BACKYARD NEIGHBOR.WHAT YOU BUY IS WHAT YOU GET, NO REFUNDS AT ALL, NO LAW SUITS AND NO NOTHING.