Did acpay use referer based authentication? Ouch, that's a HUGE hole for a 'real' paysite!! Yes, you'll probably save more bw in the long run by using proper authentication, even if your members get a week or two extra.
If ccbill allows you to 'deep link' products then email your acpay members a hidden URL that gives them a special rate for defecting from acpay to ccbill.
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