Peel it off first thing and toss it. Proud of our American tradition still being made here, but I don't need a reminder to know that, or feel like looking at it on my game.
Some people like to leave the sticker on the brim of their hats. If you like to leave the sticker on your glass then I don't see it as any different. Just not my style.
I think it reduces the value of the machine by exactly nada. That's up there with the goodie bag still being stapled in my "do you even actually play pinball?" thinking.