You do realize that most contractors don't have 100% utilization (far from it) and also don't get paid for time it takes to make sales, find clients, they pay f

You do realize that most contractors don't have 100% utilization (far from it) and also don't get paid for time it takes to make sales, find clients, they pay for their own health insurance... $150 /hr is basically the least you're going to want to charge. Realistically you're going to be looking at 90-120k /year depending on how much work you land at that rate. For highly skilled intellectual work, that's not very much money.