None of my airguns are really expensive although I do have a few which sell for a hundred or more.
The most costly one I own is a Diana RWS model 48. My first airgun was a .22 Benjamin air pistol which I ordered from Herters around 1960. It was extremely accurate but no where near the claimed 500fps.
I bought a 3'x3' 16g sheet of stainless steel for a backstop and I can shoot all day in my backyard and not have to worry about stray bullets going into my neighbor's yard.
I have a safe full of guns I don't use very often. At least this way I get trigger time when ever I want.