Can you possibly make a list of the mistakes you are talking about?, because for all I know, there are no mistakes in gambling, most especially in playing games that are completely luck based, like slot and casino games..
In sports betting, there can be mistakes that can lead to a loss, of which I myself have made such mistakes in some occasions, where in one of the mistakes, I bet on the same team/club in a football match, four different times, and they lost the match, and I also lost my bet in four places.
In slot games for example, there are no mistakes, since a player just plays, the system decides whether he wins or not, there is no way to make mistakes in slot and casino games.
We can’t say the gamblers are free from the mistakes,because gamblers are doing the gambling with the greedy and emotional decision.Most of the gamblers are get into the gambling with the intension of making money.The gamblers should take many risk in the game to make the biggest profit from the particular game.If the gamblers doesn’t ready to make the risk,the possibility of winning big money is low.The gambling is based on the luck and skill.If the gamblers playing the game with the luck mean it was the fifty percentage of the profit.So if the gamblers try a game with both luck and the skills leads to a big profit.
Except the type of mistake you are talking about is in terms of like betting or playing with money we never intend losing, or over betting and so on, if this is what you mean, then I personally will not consider that a mistake, but deliberately actions which didn't play out the way we intended it to, because for example, if the player had won, he or she wouldn't have considered the over betting, or betting with amount he or she was not ready to lose; a mistake.
The gambler who start the game never like yo loss the funds,So they keep on play the game with the skills of balancing their holding money.If the player ready to make the game with the skill based every bet,the probability of winning money is more.When the gamblers find their mistake they will not repeat in the future game.So they will play the gambling with the responsibility.If the gambler play the game without responsibility will not worry about the game winning or losing the money.Because they will only concentrate on the entertainment received from the gambling by using their real money in the gambling site.