What's missing from this discussion is the difference between copy and content. The OP is right in some regards - we don't have a big section of copywriters touting their pages and offering WSOs on landing pages. That doesn't mean the writers aren't around, there really just isn't a section for them. Also, the good ones don't usually go seeking out new clients since clients will often find their way to them, so don't look for very well established copywriters in the BST section either.
What many WF members have is a content driven website. Most "authority" websites are more content based than copy based. Copywriting is, as many of you have said, text written to persuade readers to actually do something - click here, buy now, sign up below. Content, on the other hand, is written for many reasons but primarily to inform or entertain.
Well-written copy can be hugely effective, which is why it often costs so much. Well-written content can be less expensive, even free with guest posts, etc, since it doesn't require the same specific skill set, but it can be just as effective, especially over time. It's almost a difference between a hard-sale and a soft-sell approach to online advertising.
I've seen both approaches over the last five years or so here, so there are long-form sites out there, but I don't expect anyone to out their landing pages (or even recommend their copywriter - not me, since I don't do long-form) to prevent unfair competitive advantage.
