Most mistakes in gambling happens because gamblers gambles so many times in a week, they get attached to gambling like it's daily job, what OP said about making mistakes when you stay away from gambling is wrong, you make less mistakes when you are not too attached to gambling.
The casinos even want gamblers to get so attached to gambling, this is one sure way they gamblers will keep coming back, and they will make more money this way.
If you are a smart gambler you must not get used to gambling, have fun gambling but don't expect money flow from gambling, you are just sitting on a time bomb, when the time is up you will likely lose everything or get addicted.
If the gambler play the gambling for a week time,he can do repeat of the same mistake again.Because the gambler emotion will conquer the gambler mind decisions.The gambler who was not too attached to the gambling mostly away from the loss most of the time.Because after the gap the gambler will start the game like new game all the time.So the gamblers often try to keep some gap with each game,the continuous game also leads to a loss in the gambling site.
Most of us know the continuous loss will leads to the gambling addiction most of the time.The casino was the easiest way to mange the loss and regain the profit from the same game.But the skill game in the casino was the important one in gambling site.