How to stop these heels from wearing out?

I have these black high heeled peep-toe pumps. I wear them around the house a lot because I'm trying to get used to wearing heels so they don't hurt when I wear them out. They're stilettos and the bottom of the heel is really frayed and worn out. Today I noticed a tiny tear along the edge of the shoe, one that was very small now but had definite potential for becoming significant. I put a few stitches in it to stop it from getting bigger but I also noticed the edge was becoming chipped and the shoe itself was pretty worn out. These are my only pair of heels and i need them for a Halloween costume, which is why I'm trying to get used to them, and they can't be worn out before October. Should I just wear these out and get a new pair come October? They were thrift store shoes anyways, I got them for $5. Or should I stop wearing them so much and just deal if they hurt. I can balance in heels fine, and I can always get a gel shoe insert.