I personally increase my bet when I feel like it. For example, if I gamble with a $50 bankroll and the game yields a profit equal to that amount, in situations like this, I sometimes withdraw it all or just the initial amount, but I also sometimes increase my bet to achieve even bigger wins.
It's our individual right to gamble, whether to stick with the lowest bet or increase it. The important thing is to be careful not to exceed reasonable limits, as the consequences can be severe.
I'm also on the same boat. I sometimes double my betting size if my luck is still hot and my confidence is still high. If I lose, then so be it. It doesn't hurt to push my luck once in a while, and there's always a time when it pays off.
Then again, comebacks can happen if you prolong your bankroll, and I remember experiencing it as i'm down to my final few dollars. One lucky win and a decent streak, then you could be back to where you started and more.