Is there a market for a focused, specialized search engine, for example, relatively speaking -- google circa 2010 with all the specialized search operators etc.

Is there a market for a focused, specialized search engine, for example, relatively speaking -- google circa 2010 with all the specialized search operators etc... focused on technical content? What does the business model look like? Ads (it would be in front of a very valuable audience of technical folks)? Or paid subscriptions (perhaps the community votes which resources get crawled / indexed)