Successful on Twitch?

What is the probability of succeeding on Twitch and making money? Is it worthwhile to start at all?

What would you want to do that?

So if you want to make gaming, it's going to be pretty hard to get word out about Twitch. You have to grab it somehow to pay attention to you (under millions of streamers). So making money is pretty hard.

Do you mean which games?

Well with the theme of gaming you will not have so much success

No.