Truly upscale 'girls' don't post anywhere. They get their clients/'friends' via other 'friends', otherwise known as referrals.
As for the rest of us, internet peoples, I haven't had much luck with Eros as of late; hence, my recent visits here. Being the idealist that I am, I'd like to think that Eros still has potential and from what I hear, used to be a very good site for advertising but for whatever reason, does not yield an ideal client as easily as it once did. I've had better luck on p411 but with my working in major cities with a high cost of living and doing business, like LA/SF/NY/Vegas, my luck was contingent on buying a monthly feature ad for about 350-500/month to enhance visibility during times when I was available and advertising.
I've had recent, modest luck with TER but that is because my rate has stayed consistent rather than increasing with inflation to the 800-1200/hr rates I'm now seeing becoming ever more common for Manhattan, so it is no longer high-end. TER is a mid-range site, not high-end. So my suggested requests for my time seem to be working on this site for the time being because they are more aligned with what this particular market niche will bear.
There are other forums similar to TER-you just have to do your research and try them out to see if they work for you. The rates that these forums can support seem to be a bit lower than that of TER. So if you are a provider who caters to gents on a budget (less than 500/hr in a major city), there still seem to be plenty of options.
I agree though bp is not exactly the creme de la creme. My hope is that just as Eros evolved into a good site turned not as good, maybe bp will one day evolve into a not-so-great site to a much better site, that is less scary.