The Daily Grind: How many MMOs?

Let's face it-- MMOs are time-consuming. Just one great MMO can steal all your free time, but there are just so many out there that it's hard for some of us to stick to just one. I'm paying for two subscriptions at the moment, but with free-to-play games, and a couple of betas, I'm up to about five different games that I occasionally sign on to about once a week or so..

I can't say that splitting myself between that many games makes much sense-- I mostly do it just to keep up with what's new in all of them, so I'd guess that I'm a little higher than average. So let's put the question to you all today-- how many MMOs would you say that you play regularly (about once a week)? Are you a one-game player, or do you figure the more virtual worlds you get to visit, the better?