True but even if we just consider those on mfk not your average hobbyist at an lfs. Most keep tropical over cold water/native. With online sales anyone can pretty much get anything (with in reason)Goldfish and Koi are coldwater, and very popular.
I think the barrier to natives is all the regulations restricting them.
The LFS doesn't want the hassle, and the vast majority of the customers will just pick from stock anyway.
Dont get wrong cold water/natives are cool but with strictly looks ....its hard to say they look better than tropicals...even the red bellied dace though a nice fish imo gets blown away by something as common as cardinal tetras.
Sent from my SM-G900P using MonsterAquariaNetwork App