I have a suggestion, and i appreciate that, for many reasons, this could be a complete non-starter......but I thought I'd chuck it out there anyway........
What if we were to have a "Reviewer of the Month" competition as well as the song and lyrics of the month.....
This forum is all about community, reciprocation, give and take, and everyone helping each other to improve, and so recognising good reviewers might reinforce that, encourage people to "do their bit", and make them feel valued when they do......
It wouldn't be about who gave the most flattering reviews, who gave the most "expert" reviews, or even who gave the largest number of reviews, but who really put a lot of effort into giving thoughtful and helpful reviews....
I realise that practically it would be way too much bother and too time consuming for anyone to go through all reviews posted in a month to find a short list, so maybe instead it could work by everyone looking out for people who they think gave thoughtful reviews (whether of their own or others' work) during the month and nominating them to a coordinator, then that coordinator would select 5 to go out to vote......
Anyway, just a thought that randomly popped into my head, and i shan't be at all offended if people think it's a stoopid idea!!!