The odd thing about bots is that they could even have a place in the game itself.... as NPCs.  This would include "normal" NPCs like shop owners and quest guides (people involved with carrying out the plot line for a quest) and for things like monsters or even "puzzles".

Again, thinking along the line of micropayments and incentives to build parts of the game.... players could be conceivably charged a certain number of bitcoins in order to start a quest and have features (dungeons, resource areas, etc.) opened up to those players who pay.  Lame quests would be ignored (or cheapened to be essentially free or perhaps even PAY people to play them) and really creative stuff could charge a premium price.

I've also thought about "real estate" and wondering if perhaps a type of bitcoin ought to be associated with the physical virtual space where players and characters wander.  Those operating a server and wanting to interact in this virtual world would have to "own" that hunk of territory, where they would also have to "pay" (demonstrate proof of work) to build things upon that virtual land which in turn those objects (buildings, dropped items, item spawn points, etc.).  Hunks of virtual territory could also be bought and sold (with everything on that "land") to either a virtual real estate market or perhaps to a close friend in exchange for money & "other considerations".

The problem with a free-for-all virtual real estate system is coping with the early adopters who have a big heart but no drive to complete their little piece.  This is something I really need to think through here a bit more, but since some real estate, once generated, can be sold for real money, I think some valuable pieces could come up from time to time from some early adopters who simply want to get out of the game and sell to a more experienced developer.  The question is what to do with "lost coins" or in this case "forgotten land", and if there could be some sort of way to reclaim abandoned real estate and to define what would be abandoned.  That is a non-trivial problem and something I haven't seen being dealt with very well in most virtual worlds.  One thing I would like to incorporate here is to make new "land" to be "expensive" to encourage maximizing the use of that land and adding minor details that encourage exploration of that hunk of virtual real estate.  Requiring a high difficulty proof of work might be the trick here, where "title" would be granted to that person who created the new territory.