Dave,
It took me a while to get it too and, judging by the number of "my number is..." posts I see, we're not alone. Try looking at it this way -- BF assigns a random number to each member (think of them as virtual raffle tickets). They then ask members to pick which number will be the winner by posting a number after midnight (the equivalent of picking a raffle ticket out of a hat).
I think where most folks get confused is that they believe they are picking their own number for the raffle. This isn't the case. The first poster after midnight is, in effect, the person who picks the winning number out of the hat. Whether or not you post a number has no effect on your chances of winning -- if you are a member and have posted at least twice during the month, your number is in the hat.
I hope this helps or did I simply succeed in further confusing things?
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Cheers,
--+Brian+--
I may be goin' to hell in a bucket, Babe, but at least I'm enjoyin' the ride.