Why isn't wasabi used more in western cooking?

In the west we associate wasabi with sushi, it's what raises it from being boring fish and rice to something nice. Anyone who's bought some to make sushi has probably tried the left overs with other foods. I find it goes well with cold meats and it's one of few things that makes hotdogs edible.

But unless I'm making sushi I never buy it or use it in other dishes. Yes I know we don't get the real stuff in the west just a concentrated horseradish version but it's close enough.

Thoughts?
Why isnt wasabi used more in western cooking?
Why isn't wasabi used more in western cooking?
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