The core problem is that while you might be willing to pay a small amount for search results, advertisers will pay a huge amount for your personal info ( or equivalently, highly targeted ads).
Search ads do not get a significant boost from personal info. Display ads do get a significant boost.
Targeting companies would show up to try to buy info from Blekko all the time. We weren't interested on principle, and, they were only offering less than 1% of what we were making off of search ads.
Remember: you are the product.