I learned decades ago not to have an undying attachment to anything. All you saying 'forever', I doubt it. Life changes, priorities change. I'll keep it for awhile, but have no illusion, at some point it will go, just as the other 64 vehicles I've owned.
I agree, having been through 40 vehicles myself, but as you said, priorities and life changes, and once in a while, it changes from you typically expect.
I have two keeper now, one 2 wheeler I have too much in to sell, and looks almost as nice as it did 17 years ago, and my CJ-5..
I cannot recall ever getting more than I had in it when the sale came, perhaps close, even with receipts, but when you figure your time and labor, particularly do-it-your-selfers, so I always laugh when I see a for sale ad, stating "Over 10 K invested, but will sell for 4500."
Not much of an investment I think to myself...
No doubt, keeping paperwork from accessories, and a history of maintenance helps, its never near what you have in it, even when you don't need the money... to push the sale..