We run in-house data extraction structure very similar to this (spiders, phantomJS, ocr, anonymous proxies, etc), and it indeed takes some time to set it up properly. Main problem I see with turning this operation into SaaS product is that no matter how big IP pool you have, if you have significant number of clients, those IPs will eventually all get blacklisted. Unlike the small players who create small amount of traffic and can run below the radar (and thus offer the same service cheaper).
