Had to do a similar thing when they didn't want to cover the return postage on a £30 cx400 psu, it was going to cost me a quid short of half that in postage to return it. Politely moaned and mention my consumer rights and Vaula a returns label turned up in my email account . I think they just try it on to see what they can get away with but buckle when they get caught out.
That's good to know. On a cooler yeah it would be a bit ridiculous. I've only had to send back an SSD and that cost me £13 !