I was just looking at my recent share history and the UL ratio and saw:

A torrent I have shared more than 100 times has just 4 current seeds!

shared 93 times, 1 seed
89, 2 seeds
86, 1 seed
85, 3 seeds
78, 3 seeds
74, 21 seeds
69, 3 seeds
66, 3 seeds
64, 3 seeds

Because most people stop sharing, I have over 40 torrents i can't finish, for months on end. Many are 98-99% done, but no one remains seeding them....so they sit, incomplete.