I think it would be hard to measure best practice for pricing.
Also a centralized system that could have a controlling effect on prices sounds like a bad thing, it should be the crowd that controls. That indeed can sometimes look like total chaos but it is best system to sort things out.
Ps. people pay for the things they need, making it cheaper does not necessarily make more need.
This is not a souvenirs market where some come to buy things if it's cheap (maybe it is partially so for 3D print?).
Most are looking for something specific because they need it for a project and they compare offers to get best deal.