You need a lot of talent and a high pain threshold, to walk around in these fetish heels. But perhaps, the purpose is to make you crawl on your hands and knees, or to make sure you can't run away.
"The idea (along with the allusion) is to force the wearer's feet almost en pointe, like those of a ballerina, with the aid of long, slender heels," Wikipedia explains. "When upright, the feet are held nearly vertical by the heel, thus putting nearly all of the body's weight on the tips of the toes. Some styles are equipped with supports similar to the toe box and shank of pointe shoes, though, unlike those of the pointe shoe, the structural design, construction, and integrity provide only limited mobility."
This may appease the mistress and the pain of wearing them will do it for the masochist in you. Now get on your hands and knees before I get my whip!