I've been reading this thread, and purposely waiting to reply, to see other people's posts, before giving my own.
Since I've been here a long time, those who know me, know that I like both women's feet, and tickling. 
That having been said, here is how I see it, honestly.
Most importantly to me.. a woman has to have a kind heart, character, and intelligence.   
In regard to the feet subject. 
If I met a woman who, when I explained my foot/tickling fetish to her, said the following. 
"Mitch, I'm an open minded person, and I believe in two people in a relationship compromising to make each other happy.    I'm not really into feet, but I dont mind if you play with/tickle my feet sometimes, as part of other intimacy".
I would be fine with that, and work with her, so as not to fixate on her feet, and make her uncomfortable.
If the person said.
"Mitch, you can never, ever massage/play with/tickle/ worship, or pay attention to my feet, even as part of other foreplay".
That person would honestly not be the right person for me, because, she would then be completely discounting anything I need physically, and only considering herself.   
I think many "vanilla" women who arent into feet/tickling, do find feet  "gross".   
However, I'm sure that there are many couples who dont even the "interests" that many of us on this site have, of tickling, and feet, who still pay attention to their partner's feet, even occasionally.  
Such is why I said, there's difference between not being fixated on someone's feet, and complete deprivation