Do you mean WGS (West Garden Spa)?
I assume...
Anyway, there has been much posted on this board about this place. I have not heard of anyone getting more than HR with some roaming , nor even as a regular there, have I been offered anything more. $500 for fs is ridiculous and she was probably just trying to make you stop asking. It won't happen on premises at least.
The mamasan there is very gracious and professional. I can't imagaine her actually grabbing money out of your wallet. $30 is an ok tip, not great, on the lower side. I usually tip $40 - $60 depending on the amount of roaming allowed, how much I have on me and my general mood that day. As far as the tip goes to the girl I guess for her its HMMV. (her mileage may vary). But I try to be polite and appreciative - some experiences have been better than others. For instance, 1 girl ("May" I think) gave an enjoyable pros. massage with the release. Others who have let me roam under the top and outside the bottom have gotten $60. I've never been allowed inside the pants.
Is it possible you were expecting too much, or maybe giving some attitude if she grabbed $ from you? I don't know I wasn't there but on your 1st visit anywhere its always best to be generous and remain a gentleman. BTW, I also usually tip the shower girl $5 - $7 - just for good karma. As has been stated here before its best if you go to WGS with no expectations. Enjoy it for what it is - a nice, clean spa with great facilities, friendly and relatively attractive staff with GREAT massage and HR at a reasonable cost. With that in mind you should never be disappointed.
Also, I would never let anyone grab money from my wallet and if it happened would certainly make my displeasure known. I'm still hoping for more at WGS one day but never push for it.