What I do for our games is create a per player rake called "High Hand Rake" then create a prize called "High Hand Jackpot" equal to the total amount of the rake.
I then set the House contribution on the Game tab to that amount as well.
$1 High hand rake per player; 10 players = $10 raked. Prize set at $10; House contribution set at $10
Basically, you are pulling $10 out of the pot then adding it back in as a prize via the House contribution.
Works great for us.