Part of the answer was the industries studied and part was that it isn't always the case.
Is the Orkin Man a cynic? Perhaps. Crigler says about Orkin's presence in paid search: Our trick is to be there regardless of whatever their pest phobia is, get right message there. People don't say, it's a lovely day, think I'll look for a pest control company. They say, Look, a mouse!
So I Googled "pest control" and, sure enough, Orkin's on top of things there.