Round winnings should be credited to your account immediately so you can use them on other games.
If you win a round, that round's winnings should come back at that point. 5 months into the game there could be $75-$100 in winnings that can't be reinvested into other games because they are locked up.
Freeing up the dough means more players will play more games. Since DB gets a cut of every bet, more bets means more money for DB too!