windrunner:
you can always negotiate for cim...start with the 007 (politeness is the key bro
)...
don't offer money first, and then if it is a no, then tell him/her that you'll give an extra $xxx...
in my case, i've never had to give more than an extra 0.1k for agreed cim with the 007 or with the gal...and as bro hunter said, agree to a tip with the gal and if ok, then you can get away for perhaps even a little less...