I believe you have to be level 2 or higher to be eligable for the rain.
And yes, active in chat. Some people are on it 24/7 from what i've seen
I doubt it to be honest, how do people can spend that much time just for chatting in a gambling site's chatroom? Even if there is free money from rain or tips, I do not think it is worth the time to stay 24/7 on the chatroom. If you say that you have seen it means that you did it as well, didn't you? I just wonder what kind of people who are able/want to spend too much time on chat, dont they have any other daily activities? Dont they need to sleep? lol
People leave the computer on and logged in to bitvest and chat room. And from time to time they say something.
I've seen it because whenever i logged in i saw the same people in there chatting.