For OwnersBucks contests, both the entry fee and prize pool are paid with OwnersBucks
For Real-money contests both the entry fee and prize pool are paid with real-money.
For Real-money contest, a % of your entry fee becomes convertible OwnersBucks if you have a sufficient amount of OwnersBucks. You will also receive 1% of your entry fee as OwnerBucks as a rewards.
For information on OwnersBucks to Real Money conversion Click HERE