Why?
Because I like the small biz people whose establishments I chose to frequent. And I will NOT be used as a bludgeon to beat them with.
...choose...
No, because you can wear a mask for more than 15 minutes.
If you don’t believe they work, then wear the same one. It sounds like you wear them once and toss them. That is OK, I guess. But you are spending a lot of money on something you don’t think works. Toss them on the car seat and wear them again.