Why a special section for Korean escorts? Do they come with special skills? Are they much different from Chinese and Japanese?

First, go "back to forum" to get the main or starting page of this forum.  
Look for the big blue "Search" tab. [Top 10] [Search] [New] [Overview]
Then do this search:

I do know that Korean providers are much more numerous than either Japanese or Chinese (or any other Asian nationality) as far as I can tell.

Can you tell just looking at the person if she is Chinese, Japanese, or Korean?

For me, being Asian-american and having grown up around/dated numerous Asians, yes for the most part. I get it wrong sometimes, but that's not often.

...lower-priced, higher volume, standard routine but reliably good service.  But it's very difficult for a newbie to break through the screening process.

Follow the Kgirl model when it comes to service.

Sure it's not the term that too many here seem to refuse to do a search on?

review with a "magic door" I think I'm going to gag.

Low price, high volume, standard routine?

Or more like somebody got their degree from U of BoraBora rather than Harvard

Why are there disproportionately high numbers of prostitutes of Oriental descent in Vegas and many other tourist destinations in the US?

I don't know if it really is disproportionate or not if your judging from Backpage ads only. There are more Asian ads on Backpage but more than likely they are bait and switch. Sometimes a Caucasian lady will show up after you call. Personally have read ads that claim to be Japanese but when called or made appointment they are not Japanese. I speak Japanese so  
I know. It's used as a selling gimmick for the ads.  
When I was living in Japan I could mostly tell Chinese, Korean, and other nationalities from Japanese, but I'm not so good at it anymore. What difference does it make though? If she is pretty and gives good service that's what I'm more concerned with. Kgirls might have a basic routine, but don't all the ladies? They all give a little personality and their own style. Service is usually great!

This thread reminded me of a famous name I heard of, an independent Kgirl, who predated me, unfortunately. To confirm that she's indeed 24K, I did some search and found the following thread in which she proudly declare her Kgirl pedigree. Look at all the 10s she got, must be the top Asian of all time!!
But that thread also reveals the tension over Kgirls on the LA Forum. My wild guess is that must be enough complaints to trigger a separate Kgirl Forum

In general they work for an agency run by a Mamasan who does screening and makes appointments.  They tend to work out of apartments with two or three girls there at a time.  And usually they start you off with a shower ending with a rim job.  They typically don't see Korean men out of fear of being recognized and outed at home.
When is a Korean girl not a K-Girl? One of my favorite girls was born in Korea but grew up here.  She speaks perfect, unaccented English and is an Indy.  Her service is typical of American GFEs.  She is not a K-girl.

...if you don't mind being the 6th or 7th to have test-driven the car that day.

Thanks for useful info.

rise to meet the demand.  More hobbyists are discovering the "value" in seeing Kgirls:  Reasonable rates, consistent service, so the demand increases accordingly.  Vegas isn't the only city to see this happen in the last few years.

taste so good, you don't even realize you're eating healthy!

elite as any of the top-tier girls we have now when it came to service in an attractive package, but at $1100 for a two-hour session in the midst of the recession?   I, for one, could not justify being a regular.  I have also found that there is often a correlation between high rates and high scores, as it seems many hobbyists feel the need to justify their paying an exorbitant rate, so they tend to overscore girls with high rates.   Nobody likes to be thought a fool when it comes to money.

Actually being of "Korean descent" just about disqualifies a woman from being a K Girl.

There is one gal I see who was adopted and raised by anglo parents, and other than her features, there's not much that is K-Galish about her.

Some positives and some negatives.

Try reading some reviews and maybe you will figure it out. The fact that there's a K-girl board might also be a clue.

and definitely not "Korean American"  

How do you figure there are more negatives here than positives?  You didn't ask for pro's and con's.  You asked what a Kgirl was.  Were we all supposed to respond to the question in your head, or the one you wrote down?  If your question was not the one you wanted to ask, you should start over.  Just a suggestion, since you seemed in this follow-up post to want something other than what you originally asked.

Based on a few comments above. High traffic, a set routine, difficult agency screening process, etc.

Banana yum....