I collect arms that I can afford and are of interest to me.
I plink with them all, .22's, 44mag, M1 garand, none collect much dust
I train with the ones best suited to defense and keep em close just in case
I have tried a couple competitions, even if you don't do well you can learn a lot
I also like to experiment, I am a reloader and got a couple guns due to my interests in a particular cartridge and it's potential more so than that particular gun.
I also like to try some amature smithing, I got a couple old beat up and nonfunctional guns of no particular signifigance, refinish them, fix them, then fire them, and I do some work to my store bought stuff.
IMHO firing a nice looking gun that would have been headed to the scrap heap a couple months earlier, with ammo you load yourself is probably the most rewarding experience any shooter can have.