Pretty sure they all work. No matter which one.
Even if there was a random guide on how to sell poop... If one did everything correctly, went out of their way to learn about it and became a master salesperson, I'm pretty sure they can be successful in selling their poop. Certain dirty socks to certain individuals sell well, how is poop any different in that regard?
The only problem is, I kind of don't want to sell my poop or any poop for that matter.
This is what they all come down to essentially: I don't want to get involved in illegal or otherwise unacceptable activities (knowingly lying, cheating, robbing, taking advantage of, etc), even if this entire forum is doing it (porn re-upload, for example). It's not that they don't work, they just don't work for me is what I'd end this with. (if to break down the problem in my case so as to maybe hint to a more universally shared problem that's being ignored)