If you can't afford it just accept it.
I used to think like some of you do, but I have since come to a different understanding. There are a lot of reasons rates are what they are. If you can't afford a provider's hourly quote, find one you can.
You need to understand that the donation for their time is not always about compensation. It is also used for weeding out people the provider in question has deemed less than desirable. A low donation will also increase the volume of people they have to see, increasing their potential exposure to LE and various health issues.
So before you go nagging them to drop their quote for you, consider meeting it at least once. I have found most ladies are far more amenable to working with you to meet your budget once you show them once or twice that you respect their needs as well. Especially if they find you pleasent to be around. Plus at least you'll know if it is worth it or not. Ultimately the wiser ladies want a small group of regulars, and they are far more likely to cater to that group than John Doe Firsttimer calling off their Backpage ad.
The ladies with high quotes and shoddy service will find the need to drop their quotes or relocate soon enough. Badgering providers for companionship at a discount, or worse yet OBT rates, has driven more than a few popular providers out of the Kingdom of the Rat. In the end is that really a better solution?