Personally I think just about anything can be appreciated to deep levels, if what you are appreciating is something that interests you.
For some folks, it's guns or more broadly, machinery/tools of various types. For others it's art. Others still it's nature.
I knew a guy who "collected" sunscapes. He would travel to various locations, or be on the look out for various weather conditions so that he could photograph the sun and the skies in their various hues and shades.
For me (and I'm probably going to show my geekitude here), it's games. I collect computer games, board games, card games, and various other types of games. Pretty much anything in which a combination of skill and luck meet to drive the outcome and results, interests me greatly.
Shooting falls into that category for me, albeit shooting is a game in which the gaining of skill can help to lower the dependence on luck, but then most of my favorite games favor that type of model. Shooting, like chess, is the thinking mans game.