Interesting post.
I kept my original Bridgestone tires and tubes, with less than 3000 miles on them on my 350F. I bought the bike 3 years ago, and those tires and tubes still held air in fine after all this time. I replaced them with a set of same size Duros that have the same thread pattern, and I am OK with them on.
I kept them for mostly bragging rights to give to the new owner if I sell the bike.....