That is the best way to play, just bet the amount you are afford to lose. Otherwise we can lose a lot of money by gambling, there isn't limitations, if you are betting with a 1 BTC balance, you can lose 1 BTC, if you are playing with 10 BTCs bankroll, you can lose the 10 BTCs... Big balances can help you to survive more time in game, but can lead you to a highest lose also. It's a double edged sword.
It's nice that you have a good discipline in gambling. It should be play that way, play it only for entertainment and not think of it as a source of income because there is no fixed income on it. I strongly believe that winning in gambling really depends on pure luck. Knowledge and skill might help you but will not give you an assurance to win.