i always try not to be greedy but dont know whats is the problem in my mind i become greedy always.Recetly again i won 2-3 bets consecutively in directbet and i planned to withdraw that,but my greediness increased and started betting even more,and i got the result and lost all again. 
i think you should not consider it as greediness, i think making more and more money is not only your problem, it is the problem of most of the people that they wishes to make more an more money but some time they made a mistake that lost their own money.