I see developers regularly charge $100-200/hr but as I've been researching personal branding, contractor strategy, and best practices, I've come across several alarming figures. In one YouTube video I watched it was stated that some highly specialized software developers are commanding as much as $800/hr with week-long minimums. Obviously, only large corporations could finance this without blinking an eye but the wheels of motion are slow so I just don't see this happening often at all, if ever. Does it? Obviously if it does, it's not something you do 52 weeks out of the year, but even at 10 weeks a year, you're making a nice chunk of change.
To be clear, I am not asking what the most common payment ceilings are. I am asking how much you have personally witnessed a consultant, freelancer, or independent contractor charge for (successfully) his work.