If you win you receive 1 SBI share/unit. It collects "money" every day for a lifetime. As soon as you post something that collected "money" will be used to upvote you. Upvotes only happen if you have collected enough "money" for an upvote. At Steempeak -> Wallet (https://steempeak.com/@thranax/transfers) you can even see how many SBI you have and how much money it collected and how high your next upvote will be.