As a bonus, you help prevent the spread of that deadly virus that's ailing us all! (Please everyone, stay masked, no country is really safe yet)
And therefore, I suspect there will be a lot more cold and flu cases this winter than last.
Somewhere I think I read something about how masks probably prevented 40,000 flu deaths. It makes the comments about how "covid-19 is no worse than the flu" seem particularly ironic.