Well seems you are misunderstood with what is the point from OP. I will try to explain it more easy for you, Let say you deposited 0.1 btc on a gambling site, 10 mins later, you doubled your money, you have 0.2 btc now. What will you do next? playing with all your money now (0.2 btc) or just playing with your profit (0.1 btc) and cash out your initial money (0.1 btc)?
It is not about recovery our money, because we are on profit.
I agree that it is about continuing with profit or continue playing with the whole amount regardless of winning. This is somekind of a survey asking people who are winning if they have a traits of keeping the bankroll and continue gambling with only the profit or they continue to play with the bankroll. Most seems gonna widthraw their bankroll and play with the profit which is a good indication that people somehow know how to limit their loss.