How Hard is to Make Money on Youtube

I am going to be going off to college in about a year or so and I have been thinking about how I can get some passive income while I am there. My intention is to try to get through college in as short of a time as is possible, earn a degree in computer science/ Obviously you want to turn that into a career where you earn a six figure salary. I do not think a part time job is going to fit with that idea. Right now I am wondering whether or not to buy youtube comments in order to promote my youtube channel. Of course youtube is a good way to earn the sort of passive income I am looking for, but it is not as easy or as simple as a lot of people make it out to be. You have to have truly massive numbers of viewers to make real money and of course nearly all of the so called youtube celebrities are good entertainers who have a specific angle. Of course I do not need to make a huge sum of money. I am going to need the basics of life for between three and four years if things go as I hope that they will. In fact right now I am making a fairly significant sum of money from ad revenue off of m channel. I am looking to figure out how I can double or triple it. The big problems are that I need to produce more content and that I need to figure out how to promote my channel. In the past I played a lot of video games and that is where much of my content is centered. I also do things related to computers and the internet, but I am not sure what is really the most commercially viable topic.