I think that consistently scamming people by not fufilling contracts is quiet a deed, and if anything I applaud the org that can keep doing it. If anything this will likely be a self-regulating thing. Scamming lowly-scrubs will be of almost no consequence, but won't likely provide a big-off, and scamming a large org. will surely have consequences when, and I think they will, retaliate. I think reputation will play a decent part in this game, and if your guild are known for scamming and not upholding your contracts, people will stop hiring you.