I feel if someone is addicted of gambling or anything else then he wont even let the money in the bank and he will spend it, and if someone is not addicted to anything like that and can control himself then even keeping them in a bitcoin wallet would be good too, it all depends on a person if he is willing to save or not.
That's right, for any currency gamble addicted have they will using it to spend for playing and for greedy people who have any currency in their bitcoin wallet/bank account, they will spend it to investing to whatever site which offer big profit without doing research first.
Back it to personal itself, manage money is a manage personal habit, it will be good or will be bad.