Check out amazon, or google for wonderful mobile versions of sites.
I don't understand your question - are you saying how to full site click throughs work? Most of the time it sets a cookie or a query string that overrides the session 'isMobile' value. If you meant something else - please elaborate.
OK, let's take Amazon (I was going to complain about Google's image search for mobile but I just checked it and it addressed the issues I had with it... still no pinch to zoom, though). On the desktop site, I get a home page filled with images of products that I'm probably interested in based on my previous Amazon habits. On the mobile site, I mostly get text with a small image advertising the Kindle Fire. If I browse to books, I get ~5 list items on the screen at one time, vs the desktop version (on my mobile) that gives me a landing page of bestsellers and books tailored to my interests. There's a whole layer of functionality missing on the mobile version for the sake of formatting that I don't honestly need. The reason why the original iPhone's web browser was so amazing was that it made it comfortable and efficient to browse full desktop web pages on a small screen via the whole pinch to zoom action. On a text heavy page, if I double tap it reflows the whole page to fit text on my screen.
Now, I'm not totally against mobile sites. I've seen some truly wonderfully designed mobile sites like Google's main page and some from design centric companies who don't rely heavily on long lists or grids of items. But I would generally agree with the OP that dedicated mobile sites are largely unnecessary at best and a design nightmare most of the time that actually serves to degrade the expected user experience. Users want to pinch to zoom and drag and double tap.
No I'm asking about click through rates to full sites. As in, what percentage of users choose to stay on the mobile version and what percentage click through to the full desktop site? What percentage of users know how to change their user agent on their mobile browser to only get desktop sites (probably minuscule).
As the article says, the good sites are not the rule, but the exception.
And I think the question in the above comment was simply about wondering how many people, out of all mobile visitors to a website, click on the desktop version link (what percentage of users prefer the desktop version on their mobile devices).
So what is the measure by which we are able to claim that some site's design is "bad"? I provide the counter: large, active userbase and a lot of money moving through ebay. Perhaps not enough money goes there? Do we think someone could create a competitor to ebay with a "better" site design and steal ebay's crowd? What role does site design actually play here?
eBay isn't successful because of design or lack of design. It's successful because it's where people go to sell or buy in an online auction format. Same thing for Craigslist.
Yet look at Apple, specifically the iPhone and iPod. The smartphone and mp3 player were not new innovations, but Apple's design and marketing built the world's richest company on them.
TL;DR: Design makes all the difference. Design makes none of the difference.