I've been playing on a Fantasy League at work for a couple of years now. We have fun with it and we play for money - $75 entry with $1 free agent & trade adds. Pay out is $10 for the highest score each week and a 75/25% payout at the end for 1st and 2nd place.
I don't think its an expensive league but one of the guys complained this year.
I'm curious, what is the money like on your league(s)?
PS: If you're in a non-gambling league then comment on if you think this is an expensive league.