My wife tolerates me playing games, because I always stay up later than she does, and I play while she sleeps. I only need around 4-5 hours of sleep a night, and that gives me usually from 10pm-2:30am to play, which is a ton of time.
But, the one thing my wife LOVES about this game....it's free
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I limit myself to one MMO at a time, and I recently bought a PS3, so while I pay that off, I told the wife I wouldn't pay for any online games.