I'm surprised that this thread hasn't rolled over and died. As has been repeated multiple times pirates are not currently playing Diablo 3, all that's been released is an uncracked version of the client. To properly pirate the game will require someone to successfully reverse engineer the servers at Blizzard's end as that's where all of the dungeon/loot tables/boss mechanics are stored, they are NOT available locally. It is very unlikely a fully functional server operating on the same rules as the Blizzard server will ever be available; however something coming close(ish) will likely appear at some point in the not to distant future. This is because much of the content seems to be randomly generated so fully reverse engineering the mechanics employed by Blizzard may never be possible, as information on the content generator will be lost on completion of the operation, in a similar way to integration and differentiation.
Despite not being a big fan of always on DRM, I can sort of see why it was included with the real money auction house and all that, still not buying the game but that's more because its's not my cup of tea.