Just remember... the amount of money you make isn't dictated by views and subs. Adsense is a small drop in the ocean when it comes to the bigger picture such as brand deals, merchandise, etc.
I dare say some channels with Massive subscriber numbers can sometimes be earning LESS than much smaller channels. I've heard of some channels with less than 1000 subs making 6 figure incomes simply from good brand deals. I think all that is individual.
Personally, from observation it looks like beauty and tech are the biggest money makers, but I might be wrong, and also remember how competitive those niches are.
I also knew a realestate channel that at one point, had something like 1-5k subs when I had 25k subs, but they were making 5x in adsense revenue alone. I do art so the advertising is a lot differant. More people want to place ads on a realestate video than they do on a video of a dinosaur drawing.
I think watch Linus Tech Tips, he's very transparent about how he does business and his band deals. Also Roberto Blake is good to learn from when it comes to money and business. Just ignore the subcounts because subcounts don't mean anything.