Jealous of anything in particular? I've not noticed it but maybe I'm a bit thick.
It's only human nature to feel envy if others are cleverer, richer, more successful, younger, prettier, etc, etc.
On the whole I expect people on GN are a bit older, more experienced in life and have a better perspective on things due and are full of sage advice with a sense of humour thrown in. We've been there, done that, been sick down the t-shirt.
There's good and bad in all.
I've got another 'keen'... Ouch!