First, is the marketplace at torrentinvites.org legit? Second, is it dishonorable to do such things? Third, how to avoid scams? Fourth, are there alternative marketplaces to have a sense of whether the price is right?
UPDATE I wanted to thank all for the feedback, you made me change my mind and saved my ass from some costly frustrations… good thing I asked here first!
Do not worry, you will get banned soon enough, unless you keep the seed ratio.