Make the 12th place team responsible for the engraving each year..they dont have to pay for it per se (can come out of total league dues) but an extra punishment
Have some deincentive spots to motivate those teams in the bottom (maybe last 2 or 3 teams have to kick in some cash next year)
Could have sidepools by category 10 bucks for best in HR, RBI, etc
Sidepools for most improved month to month
Usually if you have some extra prizes/incentives keeps all the teams motivated
In the league i run, I pay out top 5 for a 14 teamer (but really 4 and 5 are not great prizes just "something") bottom 3 have to kick in more money and teams 6 through 11 go in for a lottery to get that kick in money. Team 6 gets the most ping pong balls team 11 the least. Makes every spot in the standings count for something.
But if youre saying its a blast already.."if it aint broke, dont fix it"

"I'm the man with the ball. I'm the man who can throw it faster than F***. So that's why I'm better than anyone in the world." - Kenny Powers