Since this is such an unusual combination of words in the title 'Karn erotica chives stories', it's not likely that they are popular in mainstream media or literature. However, within a very small, specialized group that might be interested in this unique blend, they could potentially have some following.
I have not come across any evidence to suggest that 'Karn erotica chives stories' are popular. There are so many different types of stories out there in the world, and without more information about what makes these stories unique and who the target audience might be, it's difficult to gauge their popularity. It could be that they are just starting to gain attention in a very specific corner of the creative world, but until more is known, it's safe to assume they are not widely known or popular.
Given that I don't really know what these stories are precisely, it's hard to say if they are popular. If they are something very new or extremely niche, they are probably not widely popular.