Interesting, I hadn't heard of it before so had a squiz at their site...they don't at any point guarantee any minimum number of extra viewers.
That makes me a bit suspicious that it's not going to be a lot at all.
I am kinda tempted to find out but they also clearly state that to earn more you need to convert non-paying guests/members into paying ones and honestly that is not statistically something that happens a whole lot.
I'd say that less than 1% of my viewers actually tip.
And many of them ARE premiums already.
Might be worth trying it out during a rank month or something though?
If you do try it, please let us know any feedback or thoughts you have on it?