Great thread.
I have reluctantly come to the conclusion, over the last 2-3 years, that I am not going to live forever, and I really don't shoot what I have nearly enough, so buying additional firearms is probably an exercise in futility.
But honestly, even before that realization, what I was buying was mostly S&W revolvers and 1911s. I did buy an RM380 (three years ago) and have shot it a few times, but don't carry it, and a Kimber Solo (used, probably five years ago) and likewise, shot it but don't carry it... which were concessions to the modern trend...that's about it.
I'd sure like to find an S&W 342 and a Ruger 10/22 Target Laminate model, both are 15-20 years old.
I did buy a 1950 (or so) S&W .38/44 Heavy Duty recently. Couldn't resist that one.
Although they have never held much interest to me, I somehow find myself drawn to lever-action rifles, esp a .45/70. But I'm not a hunter, never been much of a rifleman...and as arthritis becomes more of a factor, is that a good idea? Probably not.
When I was younger, I bought stuff because I wanted it. These days, I'm trying to be more realistic about my purchases.
The good news is, I am set up to reload for every cartridge I own, and I am not short on components. So probably better not to add any new cartridges that I will not shoot anyway, and maybe concentrate on loading and shooting the cartridges I am already set up to load.
And at the risk of being redundant...learn how to reload. That is the key to sustainable shooting.