This is the analysis I wanted to do, but for the entire group of categories would have been time prohibitive (it's easy for ShowHN because that is filterable). Interesting results here
What's actually more accurate is to say that there's a site out there that claims that they will sell you upvotes on Hacker News. Whether that actually happens, where, and how is unsubstantiated (sorry dang). I edited the title to reflect that