Op, your statement is correct, a gambler always feel fulfilled once he or she withdraws the fortune made by him or her from the gambling site, I want you to understand that every gambler needs self control because that the character that can enable a gambler to withdraw once winning is involved, greed and always wanting more wouldn't let some people to apply the rules of gambling, once you gamble and win, you should know that it is pure luck because your weren't expecting wining despite how sure you are on your selections, the outcome of a game is unpredictable so once you win, you are suppose to withdraw some part of the funds for you to alteast buy some stuffs to take care of your emotions before involving in any other session that's if you must.
With the little knowledge I have in gambling, it is very difficult to win more with the money you win from gambling, you may end up losing all if good measures are not taken by you.