With the exception of remaindered books previously sold for something like £20 and allegedly secondhand CD's that once sold for £10, there are very few products in my local pound shops that sell for much more than £5 elsewhere, and certainly not for the £20+ expected from that fantasy world known as the Sit-up channels.
One day, the exploitation of misinformed/ignorant/stupid people for financial gain will be generally thought of to be just as morally reprehensible as the Black and White Minstrel Show. (Lots of people enjoyed the minstrel show just for the music, but the racist overtones now stand out as a sore thumb by modern standards.)