Can you offer any insight into how many gigs per year you booked? I know utilization rates for consultants can vary greatly and I'm curious to find our more about the relationship between number of gigs and your increasing rates.
The typical consultancy would try to sustain ~70% utilization (+/- 35 weeks worked per year). I was generally doing closer to 10, as it was a sideline to my software company. I am reasonably confident that I could have sold 35 weeks of availability, or 100 for that matter, if I wanted to run a multi-person consultancy (c.f. tptacek's comment).
