I've been reviewing a lot of new members' work, as well, with nary a reciprocating review. I thought it was helpful--I remember being thrilled at my first reviews--but maybe not everyone feels the same.
I agree that on tnbw the reviews are honest, sometimes painfully so. But that's what I'm looking for. Some other 'writing' sites seem more like chat rooms. If that's what a person wants, I don't think they'll find it here.
There's a book called 'The Rainbow Fish' that is read to youngsters across the country in the early grades. In the story, a fish with sparkly scales is asked to share his sparkle. Every time another fish asks, the rainbow fish gives away some of his sparkle, until at last they are all equally drab. Take that, Rainbow Fish! Why would you teach little kids that all they have to do is ask for something, and it's theirs? (I don't think that was the author's intention, but that's how it comes across.)
That's the thinking among some people--writers included. Write something, and wait for sparkling reviews. When they're not forthcoming, the faint if heart go somewhere else. They don't want to rewrite, change and make corrections. Let them go--it's just a pity we have to waste time meting out the truth.
It's a pity, too, that they're not reading 'The Little Red Hen' to kids in school anymore. You remember it--that's the story that teaches us if you don't work, you don't eat.