msbarnett got it -- the CRTC has nothing to do with this, and instead it is the regional rights holders. Most US television shows, for instance, are licensed to Canadian broadcasters. Most movie play rights sold to Astral Media (the Movie Channel). Etc. Even where it's a simple subsidiary of a US media company, it still leads to Canada getting screwed.

We're in the situation of being a big enough, lucrative enough market that they want to maximize revenues here, yet paradoxically we're small enough that they're usually in no rush to do so.