I think they back to gamble again because, they want to have fun with gambling, or maybe they back they they already addicted, some of them play because they expect an easy money from gambling, and i dont think its a good thing if the gambler that already stop back to gamble again
Definitely they miss the fun in gambling, I am in the same situation that I stop gambling when I lose a big amount in gambling but when I realize that despite of my loses I was able to enjoy the time I gamble, I suddenly do gamble again and until now I am enjoying it.
sometimes gambling are too fun and causing something good on your mood ,
but sometimes gambling are so terrible when you have a huge lost , you create a plan to stop gamble ,
instead to stop gamble forever bacause you have lost huge amount already ,
you just continue to play , you want your money back, this moment are the reason why people gamble again.