Do you feel the Pain?

From INC:

It didn’t make any sense. Kevin Steele, co-owner of Karaoke Star, a Phoenix retailer of karaoke equipment, noticed that the number of people clicking on his paid search-engine ads had shot from 200 to 800 a day. But despite the apparent jump in traffic, sales hadn’t budged. Steele and his partner, Diana Frerick, had built their business on Internet advertising, and more clicks almost always meant more revenue—which the pair had invested in a new office, more inventory, and a call center to field technical questions.

Full text So Many Clicks, So Few Sales