Excellent point...second hand and well worn cloth masks are best because they allow a freer flow of air.
I am still on my first 10 pack of surgical face masks acquired last April . Since I am retired, I just use them to shop. I wear the masks briefly to shop and then steam clean them for 10 minutes or so. I keep about 5 masks in the rotation. I am just about ready to open my second 10 pack of face diapers. So far so good.