It could be the lack of a venue that meets their needs? I think that's why they always skip Calgary, as the Saddledome isn't really a concert-suitable venue and the city won't give concerts permits to be performed at McMahon Stadium.
idk, I don't know how any of that works tbh. The concerts that I did go to didn't have very high production values so maybe that's it
oh and speaking of my mom randomly told me that she decided to buy tickets to see Maroon 5 in concert next year and she bought me a ticket like ok then