The set of people willing to pay for online content is tiny. Intersect that with the set of Bitcoin users and you're now targeting maybe twenty people, ten of whom are against SSO because it has the potential to track their access to multiple properties, and another five of whom require instant access but won't agree to significant transaction fees.

Maybe there's a hidden market waiting to be tapped, and I'll look like an idiot when BitPass™ reaches a one billion valuation, but it looks to me like you have a good reason to wait instead of doing it yourself: it's real damn risky.