When I win some btc in gambling, I would cashout everything to my wallet and wait for the next opportunity to place my bets. I find that leaving your btc on the gambling site will increase your chance of losing as you will have the temptation to gamble more often.
Yes, there is a lot of chances are there if we left our coins in gambling site. SO your method is useful once a day is finished withdraw all amount and wait for the next lucky day. And here we will not lose much money because next time we just play one fixed amount if that we lose we will stop so we can not lose more money here.