This is an excellent topic, thank you for posting. And thank you for the comments posted so far.
As we collectors mature (age), so do our tastes and priorities.
Here's my take: I've been at this as an adult collector "on and off" since 1988. Several of the "off" periods have been and are dictated by other life priorities. In 2011, my father was diagnosed with Cancer, and lost his battle in 2013 at the age of 67. Due to family and financial obligations (we owned a business at the time), I had to make some difficult choices, and also began to see the potential that life can be shorter than we think. During those years, I sold a lot of very nice sealed Kenner SW toys that I had owned since the early 90's. And in 2014, my house needed some work, a new bathroom, so I sold my "21 Back Boba Fett" and an "Irish 3 Pack" that I had owned since around 1991. I'm forever grateful that the "values" of the toys have been favorable to me in life. Do I miss those items? I suppose, at times, but life goes on and I have no regrets. "At the end of the day, it is just stuff", a phrase that I would have never uttered back in the 90's in the heyday of my collecting, but something that I often say now.
I feel I still have a nice, but never complete, collection of loose and MOC figures (see my collecting room in the Showcase section) But have sold off most of my remaining vehicles/playsets and other misc items over the last four years, due mostly to financial need/other life priorities after selling our family business and losing my full time employment. And I'm ok with the collection not being "complete", because I know I will never be able to afford a POTF Yak Face or Vinyl Cape Jawa anyway. I'm happy with what I have left, and with the internet, photos of those missing items are just a few clicks away.
I still enjoy collecting, but more recently have turned to the modern Star Wars line "The Vintage Collection", and "Retro Collection", which give me the excitement of "finding" new figures in the wild again, and having the old Kenner look that I am so hooked on, and at much lower prices than any of the vintage figures that I would need. I'm going to be 51 in July, and am in relatively good health. But the topic of aging, and "what am I going to do with all of this stuff" and, to the original topic, "do I buy an (item for the house or life essential) or a Star Wars toy" is often at the forefront of my thoughts.