To answer your question:
the # of chicas usually is more or less the same as is the quality. The biggest diference is that there are usually a lot of chicas that are only there on week ends "less hard core pros"
. These are chicas that have another "legitimate" job during the week, and only work the Rey on week ends to supliment there income. 
I know one chica that is (was) an accountant. Started out working the Rey/KL only on Friday nights to pay for her daughter's private school. Then it was Friday and Sat.
THEN it was 3 nights; now it is every night. Quote: I like the sex, meeting new people, learning ingles, and the MONEY" 
She WAS a very sweet and somewhat innocent (nieve) chica, 
now she is a hardened pro. 