I've found that there is a snowball effect too

If someone has less votes and its still something I find interesting, I am more critic of the whole situation to upvote

But if someone already has 400 upvotes and is on the top of the site, I will look more into it with ("woah a lot of people upvoted, lets see why" and then read the comments and some of the comments are really brilliant that it becomes the reason why I upvote the post itself too

I am sure that hackernews doesnt really recommend it but I do feel like its something that I do subconsciously that I have observed and wanted to share. It does feel like random stuff but still in a way which still makes sense for the whole ethos of hackernews.