Every time you bet on the house, 2 % of your bet is paid out to the other bankrollers according to their stake in the bankroll.
Put another way, every time somebody else bets on the house, you are awarded a portion of their 2 % dilution fee.
For example, if you bet 1 BTC on the house, then 2 % (0.02 BTC) of your house bet is spread out among the other bankrollers, and the remaining 0.98 BTC is added to your stake.
To capitalize on the dilution fee system, you will want to bet as much as you can on the house as early as possible. As you maximize your stake, you maximize your claim on future dilution fees.
This is our way of rewarding long-time bankrollers. It's never too late to become one!