Because there are few things as exciting as watching a Pickerel t-bone your lure, or watching a big mouth suck it down. Like most people, I have a feeling I have caught far more fish on soft plastic worms than any other lure, but we all love the idea of top-water lures working, because we can see the bait and the anticipation therefore is so much greater.
So keep buying topwater, it's good for your soul