Do houses always win? No! Homes almost never lose.
We've had countless cases of lucky players who have won big prizes and them withdraw money from the house to their wallet (if not a scam).
The fact is that when you win a good prize, most of the times peoples continue to bet, giving the house the chance to recover from the loss it had.

The solution is simple, plan with a limit on spending and maximum bets, the house will continue to win, but at least you won't leave grumbling.