Then why does it get nearly 15,000 exact searches per month?
I think the market of people interested in PPC Advertising goes far beyond merely domainers, like everybody who uses AdWords or AdSense for instance, which combined are a multi-billion dollar per year industry - not to mention their countless competitors.
I wouldn't put this in the same category as a domain like domainshowcase.com, however I agree the potential audience is more limited that an ultra-generic like watchmovies.com.