Sometimes gamling is just by choice when you know your gambling strategy and how it favor you you have to stick to it and do it rightly that is just the only option and what I observe in gambling, some people only gamble to double their money and some only gamble to make all the money in the whole world.
The only thing I understand is that gambling is just by choice and understanding, it not by any one rules.
Well, it's always a choice but OP's thread is if we have a different strategy besides winning and then quitting after you double it and I think it should be a plan. There are times when an online gambling casino could give more than double before it stops giving you again, more like a trap. Then, the possible outcome if we continue is losing our profits and capital.
Withdrawal is the best choice if you are comfortable with the winning amount but most of the time greed wins and then we continue gambling thinking there might be more to squeeze from the gambling site. It happens but it's too rare which is why I think OP's strategy is a good one as long as the winning amount is decent and could satisfy us.