I spent more than that on a camera lens to take pictures of birds. I know multiple people in a local astrophotography club who have spent 30x that to take pict

I spent more than that on a camera lens to take pictures of birds. I know multiple people in a local astrophotography club who have spent 30x that to take pictures of distant celestial objects for fun. People have hobbies, and money. In the case of the 5090 many people are using them to make money, so the price is dictated in no small part by how much money they are able to make using them.