If a human has to search, call and email, the business model won't scale quickly enough to ever fit the Silicon Valley idea of a startup.

Likewise if the business model is addressing unique customer needs one at a time.

There's not much value in leads for chiropractors, either. Their business grows largely by word of mouth or broadcast marketing.

If you're going to leads one at a time, the sales have to be big. The problems have to be non-trivial, and the actual research more valuable than the localized results from Bing.