My boyfriend brought a pair of keen knock-offs last year and wore them quite often around camp. He rinsed his feet and lotioned every night and didn't suffer "playa foot." The shoes however, have never regained their initial color even though he has washed them multiple times. I have a pair exactly like his and I didn't take them as I know I need closed toe shoes most of the time. I did wear a pair of flip flops to the portos or around camp once in awhile. I always rinsed and lotioned before "booting up."
I don't use vinegar though. I bring a big bag of lemons and juice one into a wash rag or the rinse bucket. I think it works just as well as vinegar, without the smell. YMMV.
I bring a pair of slip-on canvas vans, black kick ass boots, cowboy boots, and flip flops. I kind of rotate among these depending on what I am doing and my outfit

In dust we trust.