Well, Chaos Turtle set the precedent of doing M-W-F updates when he was doing the front page, so I just followed along. And to tell the truth, so far it's been working 'cause of the trickle of submissions. I'd probably keep it that way like TomB says: to keep the front page semi-fresh. That's kinda why I started doing bi-weekly polls, so that they changed a bit more regularly and people wouldn't see the same one over a month (no offense to ya, TomB about that 
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