I also think gambling in long run always ended with nothing we must learn when to stop, i also have bad experience on gambling site when i was in profit i get more greedy and than busted.
It is always happened to every gambler, they never feel satisfied on winning.
It is human instinct being greedy , noone can control themselves from this .
Even you can win for once, twice and so on there always a losing point that can make you frustrated and it is called a losses in long run line.