In the US it's not uncommon to have a $200k base. Not even taking into account stock compensation and benefits, you'd need to command about $400/hr contracting to fit your 4x figure. Does that sound comparable to your setup?
I don't know about the person you're asking, but I have known many people (both programmers and consultants in other areas like marketing, game design, etc.) who billed at more than that hourly rate, here in Europe (where salaries don't commonly go above $200k).
I don't know about the person you're asking, but I have known many people (both programmers and consultants in other areas like marketing, game design, etc.) who billed at more than that hourly rate, here in Europe (where salaries don't commonly go above $200k).