Me too! I have a foot fetish, and for socks too... that's why I love (wish) to use socks for gag and play a lot with them!
I want to add this personal thought about it, plus on the others: to feel new things!
We use hands all the day for a lot of things, we touch everything... feet just to walk no? so the only thing that they touch are the shoes. It's a strange sensation use them to something else! they are hidden all the time in the shoes too, when they come out (for me) it's a pleasure to see

maybe for the fetish ok, but seems like they need to do something else than the simple walk XD sounds strange I know, but are very sensitive, a light torture for game it's awesome, and some sexy nice things like massages or lick... well can send really nice sensation to all the body!
agree a little bit or sounds just like an excuse because I love them?
