Yes, it's a universal law: hot chicks are choosy, whether they are there for money or for fun, though many girls are there for a combination: mainly fun with their friends and secondarily pick up some money from an acceptable farang to finish the evening. The acceptance threshold will be an inverse function of 1) how skint they are that month 2) how late it is (and how likely it is something better will come along) and 3) how much they've had to drink (these variables also apply to men).
Street FLs will be less choosy, but less likely to be stunners. Also a proportion of girls are likely not to be up for P4P because they've a) earned enough that month b) have enough sponsorship money coming in and c) are just out with their mates and need a pretty special prospect to drag them away.
Whatever they are there for, remember 'sanuk' (~fun) is a big consideration for these young girls, especially the young pretty ones who are more likely to be earners.
BTW, just a thought, but are you smiling while you survey the array of talent before you, or are you allowing,unconsciously, your concerns over what the hotties' attitudes maybe sour your expression - will make a big difference to their perception of you.
Veering of topic like a patriot missile in a sky full of allied aircraft....
The answer to this age-old conundrum lies in the exact phrasing of the question:
1) Which came first, the chicken or the chicken's egg? - obviously the chicken, because only a chicken can lay a chicken's (possessive) egg.
2) Which came first the chicken or the chicken egg? - then the egg from which a chicken emerged must exist before said chicken can emerge.
3) Which came first the chicken or the egg - well, reptiles were laying eggs long before chickens evolved, and before them, fish and before them... well you can trace the advent of 'eggs' to the dawn of sexual reproduction, so definitely the egg.