So... no?
But really, if I buy more apps and not get charged, and get my account frozen, what harm would it do?
You can't get updates... nor download free ones. I accidently had this happen and owed $1.50. Oops.
I just bought some stuff with paypal and it took DAYS for it to debit. Ye gads, i had a case open with iTunes support anyway and they kept checking on it for me.
My debit card purchases are instant, much prefer this way.