That would be great, but:
- Index is only good when SEOs don't know what's inside. Buying index access assumes some level of answers given to the questions: "how do you build it?", "how do you rank what's inside?". With more than one company it's very likely to be public knowledge very soon.
- Index is the secret sause of a search engine. Not sure if anyone would like to share that.
But overall I'd like to see it. Maybe some pre-index struture? Just a large db of a page metadata? So that search engines can add their ranking on top of it.