Something I'm already thinking for some months now is that I believe that some developers make games especially where they think that many famous Youtubers will play them and push the sales with it.
Something which is always great for Youtubers are Horror games or at least games with "monsters", ridiculous games like Octodad or linear games which have great graphics and story. These are the games fans of many Youtubers seem to love to watch and these are also games which we see a lot right now.
Just make a game where you know that many famous Youtubers will play them and you will get nice sales from that alone.
You can also see it very often how Steam charts have a game selling pretty well when a famous Youtuber is playing it.







