Traffic’s not just about the number of searches either. I used to bid on ‘online gambling’ on Adwords, and the click-through ratio was always abysmal. (Less than 1%). I was much better off with other terms and phrases that got much less searches but much higher click through rates, sometimes as high as 10% or more.
Point being that even if a term does get a lot of searches, it might not result in a lot of traffic.