A lot of people do pre-auths to verify cards even outside of porn. Satellite TV providers pre-auth up to 50 dollars for a $1 signup fee, and they do it specifically to reduce usage of prepaid cards.
Prepaid cards rarely come in denominations lower than $25 though, so even if you are getting free signups that you cant rebill 30 or 40 on because its a prepaid card, try hitting the card for a lower amount and you may at least be able to get something for your trouble.
Just an idea, I have no actual experience with trying to bill prepaid cards for adult paysites.
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