I got into a conversation with my family over this, all of us had never said yes to the cashier to buy some. The way that practically beg you to buy their "half price chocolate" makes me think that the chocolate has probably been left by a radiator and got that yukky white crust on it.
I feel sorry for their staff having to flog it all day long. AIBU to ask if you have ever said yes to the chocolate? Or am I right in thinking their upselling stretegy makes me want to avoid the shop?