I have proof on this, but I'm not going to show the screenshot because it would be very obvious which site I have caught doing this. I just don't get the idea why would they do such a thing. Maybe it's part of their marketing strategy? Just imagine this scenario where you are on the mall, and you saw a crowd going crazy on a boutique with the sale being offered. That's exactly the same thing they did on this specific product.
It puzzled my mind thinking, whether if all of discount vouchers site do the same thing to boost the number of sales.
Have you observed the same thing?