I made ~$400k last year. I'm a consultant and I don't have a college education, any meaningful certifications or pedigrees and I don't even have a website.
The fact is, the money is out there. In my experience there is always a client out there willing to pay whatever you think is exorbitant, and most clients are terrible at judging which vendors are worth their rates.
If you don't get sick with fear inside when you name your rate then it isn't high enough. Keep asking for more money and I promise you will make more. It isn't unfair dealing if your client is happy to pay it, instead it's foolish if your client would have happily paid more and you didn't find out.
From an economics perspective it's an impure market. Nobody knows what the price should be for your services, including you. What makes you think the client is any better a judge of value than you?