I also work front end, I've had sooo many people give me this shit.
#1 Not advertising. Advertising is what you see before you enter the building. Some stores don't even have shelf labels.
#2 Do you think someone can walk up to your garage sale and slap their own sticker that says $1 and demand you sell them a TV for $1? No, you can refuse to sell your own shit whenever you want. It's YOUR shit. You can burn it in front of them if you felt like it.
Reddit still has better porn, for all other things I do not give a f**k.