I don't think you can pin this all on Christmas. Shops wants to see what they can get away with. Look for a more profitable model, etc..
Having said that I think you are still correct because if a shop wants to attract a "popular" WL they would have to pay a higher rate thereby increasing the price.
Girls are not objects.. but pussy is still essentially a commodity in the market, some might argue it's undervalued. I am not one of those people.