I don't think most developers realize how much recruiters are getting paid for placements. 25% is pretty standard across US, we're less then that with our flat rate.
Where I live (Ohio) that's 50% of the salary of a developer with 5 years of experience.
This is why we built this product - assuming you are even remotely decent at programming and write code in modern languages, a dev with 5 years of exp can easily be making more then 80K+.
We have several companies right now that are hiring and paying more then that for roles where the developer can telecommute 100% from anywhere in the country. Not only do they pay well but they have really awesome teams.
Fair comment however your flat fee equates to 25% of a $100k role. It doesn't become a viable economic alternative for employers until you reach the $150k mark. If your primary target is CTO level roles then great, otherwise your fee is ridiculous.
Are you assuming west-coast? Generally speaking, "easily" sounds like a stretch to me.