why always build systems which try to overcome humans nature?
why not finally build a system in which humans can use their own selfishness to help others - just live their own nature instead of changing it (from above)? just be a decentralized being instead of a forced part of a collective..

I'm for libertarian free market economies.
when there are finally free markets, without taxes and fake money.. there won't be any need for anyone to behave bad.
as you said, it's not just about the price - there are many more factors and bad behaving market participants will digg their own grave.. that's with nature, a whole ecosystem which regulates itself through all decentralized participants.
and in free markets good money is a product out of them, with good money everything is easier, so even prices wont be as big of a problem.

do you know the austrian school?