I have an embarrassingly large selection of workout shoes and I alternate among them. I have problem feet---hammertoes, bunions, high arches that need support, etc. so I can't use the shoes after a certain period of time when the cushioning starts to flatten. It's hard to determine the exact time frame since I do alternate a lot. My feet are also getting worse so shoes that fit fine a few months ago don't feel right now. **sigh** Once the cushioning starts to flatten out, I turn them into "street shoes" that I don't use for workouts. When they don't even feel right for casual wearing, I donate them to a local running store that recycles them by providing them to charities. More than the poll asked for!
Again, I can't vote on the poll for some reason. Maybe it's the browser I use or my security settings. Who knows.