I wouldn't be surprised that these agencies are quite, I'm actually surprised that they are still in business! I would say that many punters are wising up to the scams and scandalous rates these agents put on for each of their girls. These agencies need more than a discount to get any business at all.
When you factor in the costs of all the rip-off extras the agencies put on for each girl (£50 for cim, etc) the prices become a joke! These agencies never used to charge these ridiculous extras when I was a frequent visitor a long time ago, all services were inclusive of the girl's hourly rate. Either the girls offered the services that were listed on their profile, or they didn't offer it at all; No extra costs were involved.
Then you have the vast majority of girls on their books who are listed as any other nationality other than Romanian, as well as generous photo editing of every picture and under representation of their age / looks.
When you also factor in that these agencies do f* all when you don't get such a good service from the lady, many punters can see that these agencies don't really offer any good value for your money. You are better off sticking to Adultwork, where coincidentally you can also find many of these girls listed cheaper than the rip off agency rates (and where you don't have to pay the pimp / agency).