I've always liked the concept of these types of platforms, but have never felt that anyone has been able to get them just right yet. I'm still reminded of sites like Digg where the "masses" ended up catering to Harry and Mary Beercan (aka regressed to the mean) rather than towards my particular tastes. Perhaps the space here available for curators might be the solution? I do like the idea that content creators might be able to make some money from their efforts, though I worry that folks will manage to game the system, as they have all other similar systems.
The one bright spot is that people are still working at getting this type of distribution arrangement to work rather than just giving up on the idea altogether.