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Correct.
Event my self who are talking like that, also still have some hard time to control the gambling-habits. Most of people who are suggested the advice, probably a non-regular gambler.
Do I believe there has some people who can control it ? Yes, but the percentage maybe only 1-5%.
I think we all know that we need to have risk management and that we don't need to chase our losses but sometimes something just snaps in your head and you will bet crazy. The only thing that helps for me, is keeping a really low bankroll and using the vault system (but not all sites have that).