Probably because it's so uncommon. The only commercially viable tidal generator ever built in Canada (and one of the few in the world) was the one on the Bay of Fundy, and it didn't produce all that much electricity in grid terms (20MW, thank you Wikipedia). You need a lot of tidal water level change to get decent power out of tidal generation, so there are likely fewer sites than you think. Plus, one reason the Bay of Fundy station was shut down was that it was rather hard on the local sea life, although I expect some of the same mitigation strategies used on inland hydro dams could help with that if they wanted to replace it with a new station.
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