Personally I like to find solitude in an MMORPG thus I am a solo player by nature and heart. I don't really like relying on others and I prefer to get things done by myself most of the time so I will probably avoid being in a guild or a close community. I prefer honing my solo skills mostly so I think the thing that Playnot said is pretty accurate.
~ Yours Truly
MASSIVE MULTIPLAYER online role playing game. (I'll just leave this here). A lot of single player RPGs out there you know.