A lot of people want to work their lives for what they love. For hobbies? I have to say go for it if it makes you happy. But in cases of people wanting to take what they love and put it as their profession, it gets a lot more difficult and more often than not harmful, ranging from artists to video game professionals.
	For CS:GO, you've got a lot of competetion without much reward. We'll first look at making it to the pro leagues. You first need to have talent. I will probably get a lot of critism on me just complaning instead of working, but I really doubt everyone can become great at CS:GO. Some people will naturally have higher reaction times and spacial awareness skills than others, and though those that don't have the automatic advantage can still improve, in my biased opinion, when you're faced against a large community with those that have worked the same amount and have these genetic advantages, that is where you fail. There have been large discussions of this topic and I'm sure people will flame me for not doing my research and getting everything discredited because we disagree, but then again, it's my BO.
	Next is competetion. The amount of people striving to be the best is overwhelming. In order to try and compete in higher levels, a lot say you have to put in almost all of your time. This may just seem like a comitment, until you release the risk you put in. Like it or not, thousands of others who have also listented to the same advice and have grinded for years upon years to be the best stand in your way to the top, and the same difficulty goes for every single one of them. Though it is nice to imagine you just have to try and be your best and everything will work out fine, the amount of opprotunity to meet people's goals to being a top team is just not enough for everyone. For every top player, there are 100s in their footsteps pouring their blood, sweat, and tears to be like them, and for everyone of those, there are even more who have tried and given up, not because they didn't care enough, but because it wasn't a plausible reality.
	Even if you make it and join a team that does pay, what's next? While you may want to try and join a better team, everyone at this new stage is also, and the people below you are climbing to take your spot. It's this constant pressure of possibly being the next person to be cut. Even though you may want to stay on your team super DUPER badly and do a lot of practice to improve, if someone is improving faster than you, for others it seems better to cut you and take this higher talent.
	This doesn't even take into account what happens when you finally do make it onto these next to top teams. If you're looking for fame, most that have made it lack popularity, as most of the teams aren't even known, let alone players to almost all. Though I can't go into pay too much as money from teams to players isn't available, considering DaZeD said somewhere in here that he makes more from streaming than from his time in IBP, and since he has been one of the highest earners of money in CS:GO tournaments, the time and risk doesn't seem to be worth it.
	Now, what's the other side of the story? What if you decide to keep CS:GO as a hobby and do what everyone tells you not do, don't make your passion your job, but rather, make your job your passion. Now I'm sure this doesn't work for every job as many do hate their professions despite being rich, but those jobs that aren't filled with thousands crowding for one spot seem to have not only an easier time succeeding, but also offer more rewards. If you work at something with large opportunity and become good at it, you'll prosper, and for many, you'll learn to love it, while at the same time having time for hobbies that also bring you more enjoyment. "Don't follow your passion" by Mike Rowe breaks this specific point way more in-depth and better than I ever could, but if you want a further example, I can give my personal story, leading to my biased opinion.
	I started out trying to be great at counter-strike, I looked at my demos, I tried to coordinate with others and learned all I could handle at the time about the maps I played, and yet I couldn't get passed silver and gold after hundreds on hundreds of hours. I kept pushing and trying and even where many will brag about how you just need aim to be global and it's super easy, I could never ever do it no matter how hard I tried. So I did what everyone tells you not to do. I gave up. I stopped watching demos, I stopped learning new grenades and strategizing on how I could take a site and switched to other hobbies. Did I end up miserable? Not at all! I got a lot happier. I switched to what I already knew I was better than average in even though I didn't really care too much for it. General knowledge of the internet, the counter-strike community, and video editing. None of it is the best, I'm far from the highest CS:GO quality content, so I didn't touch frag-movies. I touched the informational side of CS:GO. Besides a few known youtubers it didn't seem like many really did this essay format on topics with simple editing relevant to what the person was saying, and since it fit into my general niche, I went for it. Soon enough after just making videos to try it out, I had people who liked me for what I posted, and learned to love making videos, not because I was determined to be the best CS:GO youtuber, but because it was an option for me that gave me results.
	Basically, though it is my biased opinion and others will tell me I'm stupid and misleaded and that I should stop building others dreams and build my own, I realized it's not worth it. It's not worth it to become a CS:GO pro, because of limited opportunity, it's worth it to do the things you're good at that have large opportunity, because that's the stuff you'll learn to love.