[tptacek]

If this was true, why aren't all the other high-fraud services that get declined simply having a surcharge demanded? Does the moralism of credit card companies extend to horoscopes, debt consolidators, tour operators, and infomercial/information products?

For this explanation to be compelling, it needs to capture the fact that porn sites aren't the only high-risk category for which vendors are routinely denied or evicted from merchant accounts. You haven't done that yet.