This is a great idea, but you're going to get people who pre-pay, use all their gigs, go over and then not pay any more. You could turn their sites off as soon as their balance reaches $0.00, but then you'll get people upset and give you a valid reason why they couldn't pay, etc etc..
You'd need to set up an honor system of some kind. Customers who use a lot of gigs and have been with you for 6+ months are allowed to stay at 0 balance much longer than others, etc.. something like that.
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