This has worked well for me in Fantasy Football, so I'm trying it w/ baseball this year...
I like league's with just at least a little "something" on the line. So my league is free to join, but we require all members send in $15. First place will recieve 75% of the money collected plus a trophy. 2nd place will recieve 25% of the money collected. Yes, you have to trust me of course. You would be sending the $15 to me and I will send the winnings and the trophy out at the end of the year.
This system adds a little excitment and keeps people interested.
Here's the link: If you want in, go ahead and sign up, and send me an email at firstname.lastname@example.org for where to ship your check: