I just wanted to agree with the other comments here and say something specific about one reference that PeterP said.
I spend time on www.naturescapes.net
and I would call it a "professional" forum. They take all comers, and don't care if you are a pro or not. But their standards are high, they care more about the art than the hardware and they are - basically across the board - very, very good.
I would suggest you sign up and look at the landscape forum if you want to see stunning pictures.
When several people finish in the top 10 of nation-wide or world-wide contests on a regular basis this says something about the audience. I bet 50% or more sell their work there and a good number of them do photography full-time (i.e. make a living at it.)
I started here, which is why I come back here. I teach photography and digital editing, and hanging out here keeps my brain active on the issues that beginners are facing (and answering them is good practice.) Photographically, I don't really grow much from what I learn here, but its helpful.
If you really want to be a "pro" at some point, I would suggest hanging out here (because we're so nice... this forum is consistently one of the best groups I've ever seen) but also spend time on forms like www.naturescapes.net
. They will cover completely different things and you'll learn from them both.