What are some the more idiotic and stupid mistakes that you know you shouldn't have made but did anyway. Yes this includes other none gambling stuff like sending btc to the wrong address. I'm interested to find out the stupid things other people do. 
So since you are interested to found out what other people do. So you need to search on what they are doing either where did the going to be like them. But when it term of gambling the biggest mistakes you are going to do is being greedy when you are in gambling since you had a more eigerness to take all the money.it can lead you into losing all you money insted of controling your wealth for future.