Question about reaction channels..

So basically because of a post I just saw about how we feel about people who gift subs, superchats, etc.

I just want to know how that works? If someone gifts 50 subscriptions then how much does each subscription cost? How much of the money does the reactor see at the end of the day? If there is 6,000 people in a live then do they get money based on user interactions alone or do they only get money from sub/gifted subs/superchats? If someone does like a 100 dollar superchat then how much does the reactor end up with? Seems pretty lucrative imo if you have a good amount of subscribers. Please help me understand!