I'm sorry but while it would be nice that people are truthful, that ultimately falls with the buyer to know what they are getting. Anytime you buy from an auction or even craigslist, it's a gamble. Even what seems like a nice, honest seller could have drugged the horse. In this industry it is always buyer beware.
Also I have no issue with people buying from auction, putting some time on it, even if only a few days, and selling it on. It can be a living, or a hobby. Just the same it can be done right, or wrong.