Let me add my voice to this growing chorus. I too would very much like to be able to charge a classifieds fee for some user groups but not for others.
Are we any closer at this point to this becoming a reality?
Also, I find it very disappointing that so far, I've not been able to find ANYTHING like instructions on how to set up the classifieds so that it requires and accepts PayPal payments for ad placements. I came here looking for that, but it seems to be completely absent. I've adjusted the setup otions for PayPal and I've specified a fee at the classifieds level. Is that ALL there is?