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When I ask the OP to use escrow I would expect some sort of guarantee that there will be a payout and maybe let the escrow person confirm this as well so he doesn't pull the "there were no good ideas" excuse.
This again is unfair for the OP. In your "selfish" scheme, he must perform a payout regardless of the quality of the ideas even though he specifically asked for "good ones". Why should he pay for bad ones?
I see no other possibility than posting ideas using a legal disclaimer. Everything else is just illusion.
I have never used an escrow and I will never use an escrow by the way. Being the "seller" I would never trust an anonymous dude on the internet with a decent amount of BTC. Even if an escrow has enough positive ratings, I think that for most it's just a matter of how much money is at stake until they hit the road. Being the "buyer" it's also useless. Unless you are dealing with actual goods that can be checked if they have been delivered, an escrow has no way of verifying if the expectations of a buyer have been met.
An escrow if a wonderful PR gag, and that's it.
probably Didn't like our ideas at all 
