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Trading / Economy / Socialization
In that order
None of your top 3 are...killing monsters for loot? That's the problem with this game. The devs ( and a portion of the player base) like playing economy simulator instead of killing monsters for loot.
Sometimes I don't even know why I play this. I prefer Something like Titan Quest to this. I should be able to farm a location or a boss for a drop. In this game you could play for 1000 hours and not ever see a particular item. The devs value the economy and trading more than game play. It's sad really. Could be the greatest game of it's type.
Trading and Economy all entail farming and killing monsters for the epic loot.. that's my point :)
But generally you don't get epic loot. You collect various forms of currency so you can eventually buy epic loot. Useful, valuable things to sell are really pretty rare. This is the the individual players experience and is built on a trading system. It's also why I think SSF is fundamentally flawed.