I feel like every post here has hit the nail on the head, just using a different shaped hammer each time. lulz
I would, however, add one thing to this thread that incredibly thoroughly answered your question: Why are you asking that question in the first place?
If it's just out of curiosity, well that's the reason I clicked here too, so I get it. But if you're an author and are asking in part to see if there's a way to refine your style, I'd suggest you don't. Now, that's not to say your writing might not need refinement, but just don't ever refine it with views/popularity/mass appeal in mind. It seems like anyone who does that inevitably falls into the trap of dumbing their content down, spreading it too thin to broaden out it's appeal, or in some way lowing the quality of the content their creating. And even if that does get you mass popularity, do you want to be like pop music that everyone agrees has no redeeming qualities other than its mass appeal?
If you want to do mass appeal, just write more stories that appeal to different niches. For example, if someone writes two stories that are solid quality and one appeals to the star wars niche while the other appeals to the mlp niche, that person will get more views (even correcting for the fact that they're two separate stories) than their counterpart who wrote one story of a slightly lower quality to pull off making a crossover story between the two niches. Even though the first person's following will now consist of people that don't understand each others niches, their following will be bigger. However, that following will have taken more time and effort, as they had to write two separate stories of higher quality, so in the same time with less effort the second writer could've put out another lower quality mass appeal piece and doubled their following. But the question remains: would you rather be the person with the higher number or the person with the higher quality pieces and usually
more dedicated following?
It's not impossible to disregard mass appeal and still attain it, but even if you don't ever attain it you should still take solace in the fact that you wrote the highest quality stories you could, and that was a more worthwhile pursuit than simply writing popular things that got their 15 minutes and then lost their value would've been.