I am the commish of a 5x5 NL-only Auction keeper league in KY. We meet every year to have the auction. This is a standard Roto league. There is a flat $100 entry fee that is used to pay for Rotowire's service and then all other moneys, plus whatever interest we can earn gets paid out to the top 4 places.
Our auction is usually held on the first Sunday after Opening day, which is April 11th this year. We have one open spot for a new team.
I can answer any questions that you might have about the league. Either contact me here or you can email me at firstname.lastname@example.org