Does RS2K verify providers in any way?  Does a provider's appearance on the RS2k website give any level of comfort as to a lady's being legit?

Cathy does screen the ladies.  If you have any specific questions you can always email Cathy.

Her email address is on the RS2K website.

Cathy does verify that the girl is a provider but not if the pic is real,unless the gentlemen complain that the pic is phoney, she won't know.

You bring up a good point.  Since Cathy is so accepting and responsive to feedback, it's important to give her info on questionable providers who use phoney pics, upsell, etc., so as to keep RS as the premier advertisement site.  All it takes is a quick email.

Cathy is diligent in verify both provider's and hobbyists.  

As Appropro indicates, the only time that she questions a lady's appearance is when she receives complaints from gentlemen.  Then she requires a new and valid photo, or removes the ad.