Yeah, I haven't made any withdrawals yet for that reason. I just think for micro and small stakes that the dollar amount of the withdraw just doesn't outweight the potential future profits that money could be used to move up in stakes with. I also think it's important that the bulk of the money you've used to move up is from beating the previous stakes. So, in your situation, make sure your NET winnings from $10NL is at least $300. If the bulk of it is actually from $5NL or smaller, it doesn't mean you're necessarily ready to move up.

Also, just to argue the other side. Some players and coaches have sung the virtues of withdrawing money. They cite that poker is meant to be fun AND to make money, and that if you're never withdrawing money and using it, you're never rewarding yourself, which can be bad for your overall game. I've heard more than one player say that by withdrawing money and using it to buy something nice to enjoy, that it helps renew their enthusiasm for the game. If they have a tough day at the table, they remember that purchase they made and that it's worth the struggle.