Brewerys usually have dozens of beers. If it is predominantly IPA, then that's because it's selling like hotcakes. Personally, I don't really care for the taste. I can take it or leave it. But if I'm looking to buy >$10 beers, I'm going for the highest ABV which is going to be an IPA. Sometimes you get two for one, essentially.

You can't even trust bartenders to pour proper wells these days, charging $13 for an 8oz glass of Coca Cola and a drop of well brand just so you can see them reach for the bottle. The IPA fits in line with my boozehound on a budget lifestyle and always is the stated ABV.