Makes sense if...

most of your regulars already schedule 4 hours or more. If you're getting just as many new clients as before, then they probably like the fact that you're more exclusive.

Since I up my rate and minimum number of hours last year, almost all calls and requests I receive are vaild.  No more unwanted emails or bargin calls.  I must also agree on the client type.  These guys are just on a completely different level.  I once had a regular client's assistant called me up to make an appointment.  You could imagine what kind of big wig I am dealing with here

It is market segmentation.

By that I mean that you must be very attractive physically and in a classy way.  Also, you must be able to carry on an intelligent conversation with the gentleman.  When we are together for 4 hours, The BIG head will demand some attention and stimulation as well, as the little head is only good for shorter durations, and has some recovery time issues.  

If you are a complex, intelligent, personable lady who is also very sensual and creative in ways of intimacy and are prepared to share that sensual creativity (as opposed to just engage in some standard physical activities) Then, by all means, take a shot at the upper echelon of the market.  But one needs to be honest about one's self-appraisal here.  By your post, it appears that YOU have the goods.  But by NO MEANS do most ladies in this business have the goods.  

If one pays the freight and buys a Mercedes, it better not run like a Chevy.

I mean are there so called "High Class" escorts and mid-level escorts and low-end escorts?  If yes, I would assume the mid-level and low end escorts populate the malls and similar web sites and are the ones who have benefited from the Internet.  While the upper end escorts don't advertise, but gain clients through word of mouth.  Right or Wrong?  I'm just guessing.