I agree with you the US should going forward have a PPE subsidy for manufacturers going forward. You and I agreed that it would have been a good idea to do that at the start. At the current time, though, price equilibrium has not been reached (not at $80) and the masks aren't readily available to everyone that wants one (only the well off willing to pay a premium for them).
But again you don't get to build the world you wish existed...you can only behave in reaction to this world. You are courteous (you wouldn't go out sick), you are vaccinated, you are tested. You are very low risk to infect others through asymptomatic spread. The N95s right now primarily serve the function of protecting you...the studies you cite say surgicals are good to protecting others...one more N95 mask out there doesn't do a whole lot to protect a supermarket, especially someone who is as courteous as you. What it does do it drives the price up for people that actually need them.
When you can go out and buy a 40 pack of N95s for $20 on Amazon through a large retailer (instead of a hoarder) like I did prepandemic, have at it. Otherwise you are just being selfish when others need those more. Should you be able to get one including a US manufacturer? Yes, I agree you should, but we aren't in that world.