Had to pop into a sports shop the other day for some camping items. I already had the two main things I was looking for in my hand. I asked one of the sales people if they had a kettle for boiling water over an open fire. He said they were sold out, but then asked to put his salesman sticker on my items I had in-hand. I let him and didn't care too much at the time, but thinking back the guy took 2 seconds just to answer a simple question for me. Why ask for commission on the rest of my stuff?
I don't blame him. I blame the system. Commission based salesmen generally suck to deal with.