Let me say this: 270 at 6 foot 2, you won't have many girls turn away (except in fear of dealing with anyone taller than 6 feet!). Even in my few visits to Macau I have seen some guys who were, well, "living large" on a scale most of us would never want to touch. As someone mentioned, the girls are pros, they know the deal, and they usually deal with it.
I would say that like anyone, if you are doing this in a fishbowl / lineup sort of a place, watch the girls closely. The gamers will try to get your attention, the ones that are put off by your size or shape will avoid eye content or look away. No matter how hot they look, don't select the avoiders as you will end up with almost certain disappointment in the process.
(side note: Myself, I am all of 5 foot 10 and realistically I should be 160-165, and I tip a little closer to 185 - 190 depending on the day). I can get down there if I really work on it, but it ain't living! I'll probably cut 10 pounds off before my next trip, at 175-180 I am "fine" enough.
)