Bear in mind, 900 Billing works in US only and yet the whole world can see your site(s) - most of whom do NOT have a credit card, ALL of whom have access to a phone or cell.
Since the payouts on offer are less, simply give 'em less time.
Properly implemented, phone billing will add considerably more that just 0.5% to your bottom line and will help take your brands global.
Hit me up anythime with questions
