There are 27,000+ partnered Twitch streamers that probably makes a decent amount of money. But the majority probably can't make a living with streaming alone. The top 0.01% of partners like Shroud or DrDisrespect can make millions.
https://www.twitch.tv/year/2017/factsheet.jpg
The mod team is quite important indeed.
https://streamernews.tv/2015/10/28/guest-writer-moblord-disc...