If they make your feet feel good, then they are worth their weight in gold.
I only buy Birkenstocks for my feet. I have so much trouble with other kinds of shoes that I don't even bother. Birckenstock makes a soft-foot bed shoe that is like walking on clouds. I only own 4 pair of shoes and they are all Birkies, 3 of them the softbeds.
I work 12 hour night shifts in a hospital and am on my feet constantly. Without my Birkenstocks, I would be in misery. My shoes last me well over 5 years and that is why I don't mind paying $100 for them.