I've started to really use this as a gauge of whether girls are "into" the session or not, and see this a lot more in the non-WG segment, primarily with girls from seekingarrangement.
With many WG, whenever they need to lube themselves up, it's usually a turn off for me.  The stories of girls getting banged by 10-15 guys a day is just too much for me, and I pity some of them who do not appear to be that much into the sessions at all.  

Just wondering if anyone else out there is chasing "dripping wet pussy"  

As I only do KTV, my experience with the next inline has been minimal.  However, since KTV girls may not get laid every night, it may have something to with I've never had a dry one, in fact several hae been the dripping wet you may be looking for.  
My normal approach, for what it is worth, is I take the girl back to the hotel after fun and games in the KTV.  I usually have a suite so we go to the living room where I have some porn playing.  Some will say they don't want to watch but I go ahead and sit with them on the couch and a little playing around will insue with at least part of clothes off (I don't like to get them fully nude at this point).  Then I suggest they go take their shower.  When they return, usually just in a towel or robe, then a quite kiss, touch, and I will go take a shower also, and take my time!  Note that I have left the porn on and they are usually right in front of it, and since it is playing through my computer, they can't turn it off.  Many times after taking a good long shower, piss, etc, I have came back and the girl is rubbing her pussy and watching very closely the action on the TV.  WET, you bet, even to the point I have had to get towel to wipe it off.  From that point on it is wide open.  So far, unless I don't want to wait, this has worked every time.  And since I enjoy DATY it is quite nice to have a hot pussy waiting.

maybe it's because you're an UPSCALE mongerer that you didn't get any response from us lay people blue collared Star Ferry cadets.

"...I have came back and the girl is rubbing her pussy and watching very closely the action on the TV.  WET, you bet, even to the point I have had to get towel to wipe it off." -- MAYBE that's true but you said "usually" and "many times".  I used to be an agent.  I highly doubt the accuracy of the girls' behavior.  Unless she's acting for you.  Of course any smart girl would do what she feels pleases you.  You got the money so continue being happy

Nga Pui has a pretty well pussy, which I know from experience.  She does say that she can squirt, however I've never been able to make her squirt.  For lack of trying.

See, many people only go for the chick once because they want something different every time. I find something good I'll go back every now and then because they know what you want and you'll find out what turn them on. They're also more receptive to you and more friendly. When they're in a relaxed state it's easier to turn them on.

Many WG that I visit started with lubes, few times later I can stimulate them and they let me right in without lube, some even like you said, dripping wet.

I would have to agree with jeffzeke, a girl is more likely to be wet if she didn't have sex with 10 guys before. Excluding those that are easily wet.

I remember that HKH gal i met her in HK and then Sz when she finished her tour, resting and getting beauty treatments for few days in Dongmen lu as many other HKHG do.

Both time i saw her in Sz, she was crazy wet and creaming,  way more than the first time, dripping down all over my D and balls.
I don't think i was doing it more right, as i was at the time a bit more selfish and often not specially a pleaser with wgs as i tried to be with gfs, S.O.  

I had that same pattern repeated several times since then.

I am also a believer that not only the foreplay but also the girl mood and emotional preparation can also raise drastically the dripping.

I gauge my success by the diameter of the wet spot on the sheets when we are done. My record is about 30cm.