I presume the OP is going to be hired as a contractor, so out of that $30 comes payroll taxes, health insurance, office space, computer equipment, software tool

I presume the OP is going to be hired as a contractor, so out of that $30 comes payroll taxes, health insurance, office space, computer equipment, software tools, ongoing training, conferences, etc. If you work as a traditional employee, then the employer is paying for all (or most) of that, and it's not cheap.