The problem with fish eyes is value for money spent. Remember two aspects of very wide angle lens. They flatten out a distant scene or distort a very close one. They are a very specialized lens that must be carefully understood in order to be used effectively.

I would use a fisheye taking off or coming in for a landing in an open cockpit airplane in a hilly or mountainous area, doing a canyon shot from either the top or the bottom in British Columbia or in various areas of the U.S., a city shot from the roof of a tall building looking down, a shot from under a ski jump as the skier is taking off, a shot from a parasail or a hang glider, etc.

The problem is that there are not that many shooting locations, nor activities, nor subjects where the fish eye lens is the perfect answer for the shot. Photographers develop an eye for seeing a shot, the way they would shoot it but developing a "fish eye" is next to impossible for most.

The result is that it would be difficult to get sufficient effective fish eye shots, to make it worth the investment.

Ronnoco