You post an interesting thought or two, Janet. When I log in to the site first thing in the morning, and I find that I have 10, 12, or even 23 new postings, my inner-self begins to shout 'no. no way'. I simply don't have the time to read, and more importantly, give a good review, to that many posts. So, I do as many as I can and hope that the next day doesn't bring any more. Complicating this is that my eyesight is nowhere as good as it should be. I wear trifocals and peering at a screen for more than an hour (even with the magnification and de-colorization of the chapter -- thank you, Sol) gives me a headache.
You mentioned donating points. That might be an inducement to old-timers on the site, but a new writer doesn't have that option. I can see where the rating star system would not be a very good idea - and I wasn't a member of the old site. I used to be a member of a forum where stars were given for providing a solution to a problem. This didn't go well at all.
Maybe there just isn't a solution. In my case, I favor just PM-ing a steady reviewer and telling them how much you appreciate their continued support. It can be part of the 'finishing blurb' on a review, but personal contact is my way to go.
Somewhere out there is a solution. We just have to find it.
~Tom