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Personally I would like to see more of the RMAH in MMO's. The game would have to be tailored for it though. I'm guessing Blizzard doesn't make nearly as much as they would if they charged a subscribtion fee for D3.
I wouldn't want it to be "buy to win," but i think it would be a nice feature to have for stuff like non combat pets, comsmetic gear, and consumable items, like gems, enchants, food, and pots. It can be expensive in game cash to keep your gear enchanted with the best enchants and gems in WoW for example. Many people don't want to waste their play time farming.
Imagine being able to actually make real money off your crafting profession.
Of coarse no one has to spend money on these things, you could always go out and farm the mats and craft the stuff yourself, or have a friend do it.
They might have to rework gear making professions, or just limit the things they can sell for real cash.
I think it would be awesome if I could at least pay my game's monthly fee if nothing else from selling in game items.
I think it could work for both P2P and F2P ( or B2P, basically the same) games.