Looking at the replies in this post, I'd invite those who have played or are currently in a league first. Not to discriminate against anyone else, but at least you KNOW they'll play their games. Anybody can sign up for a league, or as my boy Seinfeld said:

"You know how to take a reservation but you just don't know how to hold the reservation.
And that's really the most important part of the reservation - the HOLDING. Anybody can just take 'em." © Jerry Seinfeld