[Aluscia]

yes. It's interesting seeing the different games fight this problem.
FFXI completely ignored the problem, creating such a massive inflation that items I bought/sold a year ago have tripled/quadrupled in cost, while drop rate remains the same.
Lineage 2 did very little to address the problem, and it was compounded by the fact that dwarves were the only ones who could scavenge and Craft... so you have people with bots playing 24/7 on characters that were too tedious for real players to play. nice.
WoW wasn't terrible, given the open pvp concept... it's too difficult for people to just leave themselves farming a given area afk and expect to remain alive.
EQ2... Until recently, it was nearly impossible to solo. Money could only really be made through harvesting/crafting, which is extremely difficult to do afk. I think farming was pretty effectively shut down for that game. Plus, there is not a great enough demand for the currency, so...
City of Heroes is the *only* game I've played where there are no bots. Why? Because influence is so easy to come by. There's no reason a player should have to buy currency off the internet to be competitive in this game... the big reason being that up until May 25th, there was no PvP in the game.
Interesting Concept of the future - Roma Victor is proposing no monthly fees. Instead, they will be selling in game currency through their official site, limited for each player account of course... I'm interested to see how this works. If they set a low enough threshold on money, it will be extremely difficult for players to sell the money elsewhere.