First off, let me say I admire Jay C's writings immensely, and I've enjoyed reading every last one of them.
Second, I agree with the points that he made. My writings amount to possibly 1/10 of 1% of the volume that he's turned out, and his quality is much better then my efforts.
That said, my experience with feedback here has been generally positive (probably for the simple reason that I haven't written enough to bring me to the attention of the Grammar Police and nit-pickers).
I've made contact with a few authors to point out an error or two, and have been generally well-received for my efforts.
As others have stated, I write for my own amusement, and occasionally to help myself get things straight in my head.
I enjoy getting positive feedback. I also enjoy getting constructive negative feedback, because someone cared enough to read my stuff and point out a problem.
The one or two trollish comments that I've gotten, I simply ignored. If I started getting enough to annoy me, I'd probably just quit reading the email I get from here.
As others have said more eloquently: You get what you pay for(hopefully). This is a free site showcasing mostly hobby authors. I, for one, am grateful for the stories I've found here, and I'll take this opportunity to thank my fellow authors.
Also, I should thank Lazeez for providing this site.