I setup my brother's small business stripe integration, and I wrote and tested the API calls to charge customers. Stripe doesn't know anything about his business except transaction sizes, and a bunch of info they definitely can't resell (TIN) or is already public knowledge (business name, billing address). I doubt they have anything helpful for pricing, though they might be able to analyze gross transaction rates and geography. I have never checked what their contractual obligations are with that data, I imagine if they started sharing it that would get out pretty fast, and result in them losing customers rapidly.