I used to always get my Vasque boots resoled, sending them to Dave the Cobbler in Seattle. He does a wonderful job. He will resole tevas, trailrunners, Birkies, etc. but I am not sure it is worth it with the less expensive shoes. It is not cheap.
I can no longer wear Vasque boots, alas, since they don't come in my size any more. They stopped making narrows. I am going to Tucson in August for WFR recert and may see if Summit Hut can fit me with something. Until then, I will stick to my crummy New Balance hiking shoes since they do make my size, kind of. They are still too wide, even when labeled "narrow." I have to add insoles, double sox, etc.
I can't imagine having my act together to the point of keeping track of miles used per shoe. Who has time for that? All I can say is, Vasque Newbriar and Sundowner boots lasted forever. Cheapos I wear now last less than a year. I am not too hard on shoes as I am a small person and light on my feet.
And I feel discriminated against because my size is no longer available. Grrr... The whole topic of hiking shoes throws off my day. I spend hours on the internet researching boots and shoes, trying to find a vendor who still has some Vasque boots leftover in my size, or other brand besides crummy New Balance.
There is a point of no return unremarked at the time in most lives. Graham Greene The Comedians
A clean house is a sign of a misspent life.