Totally not related to the original question... but how much of the game (% wise) can you do as a 4-boxer, assuming all battle mechanics are solvable, etc?

Similar to wow, you could do instances with 5 accounts, but not raids by yourself (I stopped at early Cata, so I am fairly sure some of this has changed with Raid Finder).

I'm almost always interested in doing everything myself, but even though I own 4 copies of FF14 on my, I haven't started playing yet until March, but I am always worried that there is a point where I'll have to stop.