One of the great tragedies of my life - and let's face it, there are many! - was losing most of my marathon T-shirts!
I used to compulsively collect everything from the 'thons, too (well, not quite like Carter does

), and wore my 'thon T-shirts often. One evening, when I lived in Grandview (so that would have made it 1997, I believe), I dropped my laundry off at one of those self-service coin-op laundromats, went across the street to Kroger to do some shopping, and came back to find most of my laundry stolen!!! Among the two washing machines I had loaded up were most every scifi and horror T-shirt from 1988 to 1997 (I missed the first scifi in '87).
I was so grief-sticken by that event that I painted my nails black, put on some black clown make-up, and swore vengeance on evil-doers everywhere!! ..... Well, ok, I didn't do that - but I did stop collecting marathon paraphernalia. I guess I felt, since my collection had been wrecked already, it wasn't worth trying to be completist about it anymore.
In hindsight, I kind of wish I'd kept on collecting the fliers, program guides, and Marathoid Certificates - that way, maybe I wouldn't lose $20 to Joe Neff every time we have a disagreement about marathon history!