Thanks for this thread. I see I don't need to feel shame, after all.
My least used bike is the Tifosi CK7 I bought to reward myself for getting back in the saddle post-prang some nine years ago (really? where did that time go?). I did some commuting, a bit of utility cycling on it, a couple of round the IOWs and an audax or three. The Ridgeback fast hybrid that bit the dust when we were hit by a car driver, by way of comparison, clocked up 100 commuting miles every week for ten years - plus loads of extra-mural riding at weekends.
I'm still not sure why I never really got back into the swing of things. A combination of road-fear and not really liking drop bars, I think. My most used bike these days is my Dahon folder.
If anyone wants to make an offer for a lightly used (by yacf standards) Tifosi, drop me a line.