When I left school at sixteen I had my first job at Curry's. Now, this was 1984 and things may have changed but having done the "sales" course this is what we use to do.
A person comes in and looks at a washing machine. You ask "How may I help you?", as the conversation begins you start to throw all these little facts about this lovely washing machine in. If it's a cheap one you will give basic facts but the one next door to it, which costs more, gets the special treatment. They then come up with the line "I cannot afford it". This is where the true up-selling begins and they don't even know it. You say "Do you want me to find out how much it is per month?" So you work out the figure, you have the washing machine plus an extended warranty plus delivery plus unpacking and setting up. All those extras could have added another £150 on top of the price of the washing machine. You work out the monthly total and say "That's ONLY £**.** a month, and if you sign up today I will get it delivered, unpacked and ready to use and even take the old one away (the delivery driver takes it down the scrap man for a back hander) oh, I nearly forgot, I will throw in a five year warranty!" Now to people this sounds a great deal but they have paid for all of that, and, because it's gone on a finance deal they will pay interest on all those "free" extras. We where under a lot of pressure to sell, it was without doubt the worse job I have ever had. I am happy to say I didn't last long as I felt I couldn't rip people off.
Like I say, this was a long time ago and modern shops may not work like this anymore.