The bottleneck is that I sell a service and I can only offer so much of it. Also, my base rate is 100 EUR/hr, about $125, although I always quote a fixed price.
I found a niche in writing Mac device drivers for a big company this year. I had to buy a hardware USB analyzer and IDA Pro to reverse-engineer a good chunk of LabVIEW so I was able to charge a good price for that project.
I could raise my base rate and charge more for projects (fixed price) but that doesn't scale and there are only 24 hours in a day.
I found a niche in writing Mac device drivers for a big company this year. I had to buy a hardware USB analyzer and IDA Pro to reverse-engineer a good chunk of LabVIEW so I was able to charge a good price for that project.
I could raise my base rate and charge more for projects (fixed price) but that doesn't scale and there are only 24 hours in a day.