Why are you merchandising AFTER the register?

Why do stores pile up a bunch of stuff with big sale signs on them right AFTER the cash registers? I have actually thought once or twice, 'Oh, I could use that,' but if I've just stood in line for 30 minutes, there is just no way I am going to get back in line to buy one more item.

I think that maybe the stores are just out of space and don't have anywhere to put these things? It just seems silly.