What you're describing already exists with many billing solutions in adult. However, unlike mainstream with Paypal, most of adult doesn't have a single universally adopted model that would allow users to use the same banking info from site to site.
What this means is if a user signs up to a site processed by Verotel and submits all of his info, that info will not be available for when he wants to sign up for a site processed by Epoch. He will have to start the entire process over again.
However, if that user went to another site processed by Verotel, he would be recognized and the signup process would be easier.
In essence, the solution does exist, but it lacks a player that communicate with all processors to share data and enable easy signup flows for all sites and processors (what paypal does in Mainstream).
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