no one will know if he is lucky in that day or not and we could only keep playing which can lead us to get a lose. Bet on the same rate could be a good choice, and I think it's the best you can do in gambling games. Maybe in someday, you can try to lower your bet so you can get a low risk too 
I think no matter if we use low or high, as long as we can keep steady and not chasing the win, we could play without emotion because we enjoy the game.
It is not possible for a person to claim that a particular day is doing to be lucky for him.I think no matter if we use low or high, as long as we can keep steady and not chasing the win, we could play without emotion because we enjoy the game.
We do not know either we will make money from gambling or not, therefore I think it is too much important for us to play gambling with a good strategy and with a limited amount of money, which really can help us and protect us from a big lost.
We should always try to play gambling with such amount which is easy for us to afford to lose and which may not create any financial problem for us if we lose it in gambling.