I've had quite a bit of luck with RBs, though I do find responses vary wildly.
I had an excellent overnight with Jenna Lynn last year, which had got a huge amount of interest from a lot of respected girls, most of them at well under their usual rate.
I've also had good results for 1.5 to 2 hour RBs, often where I have specific requests for dressing up, services etc. Its a great way of finding girls who are ok with taking pictures, for example.
One of the key things I find is WHEN you are wanting the meet. Before midday rarely does well. Typically afternoon to mid-evening seems to work well.
Also use a sensible rate on it. For example, using 100per hour pro rata seems to work ok.