The fewer Leaf visits certainly help, but trust me - I get 10x the people asking me for Canucks tickets as I do Leafs tickets. Hell, I used to be able to still find Leaf tickets at Sportchek. Habs too, for that matter. And this was back when they didn't even come here every year (they visit annually now, that changed a couple of years ago)!
Maybe it depends on which circles you run in. I know a lot more people here from Edmonton or BC than the Maritimes.

I also base it on how many opposing jerseys are visible. The 'dome is almost half Canucks jerseys these days.