Quoted from Aurich: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.
I don't think it affects value that much. Instead of thinking of not having the sticker as detering a buyer, maybe more look at the sticker as an added bonus.
I once bought a brand new American Fender guitar and the shop peeled off all the USA flag stickers. It was a bummer to the OCD collector like me, but you gotta' rock on and I bought it anyway.
I'd also pay more for a scuffed play field than one that's had paint touch ups. As original as possible, I say.