Maybe it would be a better idea to leverage the bad dreams...which are, among other things, ways that we cope with the real world or things in it that we're "afraid" of. I would think that simply denying/blocking someone's ability to have the bad dreams could be worse. We need to learn how to work with how things work, rather than assume they're wrong and try to change them.
Sometimes we're able to process the bad dreams and move forward, sometimes that's not as easy as it sounds...especially for those with PTSD. Forcing someone to have good dreams sounds like giving them a kind-of Advil...it blocks the pain receptors (as I understand it) rather than fixing the actual problem.
Advil is OK for some things, but it won't fix a broken leg.
Should the few "bad eggs" put the whole idea out to pasture? Do you have another site/company that you recommend, or are you just against the whole idea?
A freelance is one who gets paid by the word -- per piece or perhaps. -- Robert Benchley