Here's the problem with hosting a CS:GO tournament: People just won't show up. It's a hard reality but that was the main problem with the CS:S tournament (Besides some idiot that lo3'd mid-game...). I BARELY got enough guys to sign up for the tournament. (43) And needed around 7 subs THE FIRST DAY!
I would need solid evidence you all would show up. And even then, it's a lot of planning.
A tournament would depend on you guys, but life will 100% take priority over gaming. Perhaps if I got a list of people that signed up prior to announcing a tournament, I could decipher if it would be worth planning; but I'm not going in to this tournament blind like I did CSS.