Interesting take. I'm not aware that anyone is doing vote rings or vote buying very successfully (considering that my own blog also makes it at an expected rate, and I know there isn't a group of friends voting that up) but I kinda assume that this is a thing for some of the bigger launches where they are hoping for conversions. Beyond a defined group coordinating their posts or votes, though, surely HN's front page can't be seen as vetted beyond "oh this looks trendy/hype"? People don't vote only after trying out the product or reading the full article. In many cases that would mean voting after it has already disappeared off of the front page for good