Depending on the jurisdictions involved (where the server is hosted and where the admins live), I can imagine there may be very different laws and regulations governing a forum of user-submitted content and a business acting as a publisher and producer of porn content. A great idea, but not as simple as just having the money to do it.
I just went into Google payments and changed my address to a made-up Philippines address and I pay 239 pesos or around €4 for premium family. I think the individual plan is 159pp/€2.66.