I think it’s a solid idea. I would love to contribute more but I’m always busy with my “real life.” I can’t speak for anyone else but I’m sure others are in this boat as well. My lack of contributions doesn’t mean I have any less support for the project, it just means I am busy with IRL. So, what am I saying? I guess it just comes down to the person and how much time they have. The $$$$ incentive is fair but it just depends on the time each person has. I would contribute for free if I could.
Overall, I think it’s well thought out. I don’t have specific answers and can’t predict what others will do. I can only give my POV.