Why not allow each team to purchase 1 ticket with the winner receiving all of the money. For example the ticket could cost 50k, so let's say 20 managers purchase a ticket, there will be a winning prize of 1m.
Second idea would be for tokens, so let's say each team can purchase only 1 ticket per day for 1 token.
Let's say there are 20 tickets sold, you could have a payout structure such as the following;
Winner: 60%
Runner up: 35%
IGP: Retains 5% (or no tokens for igp and runner up gets 40%
Just a nice optional feature that can help boost managers money and/or tokens.