the problem with building for retirement, is tastes can change. I still love 1800 reproductsions, but if I had a stack of fossil ferns which were madly popular, or i spy type fabrics, they might as well be compost in a quilt room. I quit buying fabric in 2001, so before bundles and cakes and rolls. they all seemll Very fashion forward colors and prints, what I'm seeing in the shops now; those type of things will look more dated in 10-20 years than even the blues and mauves of the 80's.
What I see going out the door in boxes here is fabric yardage bought because it was on sale. That is no reason to buy for art.
You would be Far better off investing your money in a fund. My 2 cents and worth what you paid for it.