People are different, but i'm under the opinion that you shouldn't withdraw and spend your money until you have a large number of hands under your belt, a really big bakroll and you are completely confident in your game.

I've been playing for about 3 months, and i have about $4400 now, but the only "withdrawl" i've made was for poker tracker. I think i will probably start withdrawing when i get to 10k or so, and even then only in amounts that are almost irrelevant to my bankroll.

However, if you feel you want to withdraw your "losses" thats fine, i just don't agree with it. As long as you still are properly bankrolled (ie. a minimum of 15 buyins) for your stakes you can withdraw as much as you want.