People are disposable resources on par with other equipment and machinery in today's business world. Getting paid anything less than full market value (including cost of benefits and a premium for being disposable) just doesn't make sense. The only company I work for is Me Inc.
However, after attaining pretty much the highest level I could as a consultant (i.e. running teams of employees who reported to me) I hit a ceiling.
I found myself at a level within the company from which I could never advance if I didn't become an employee. I stayed at this level for several years and decided it was limiting my growth as an individual.
So, I've been working as an employee for the last 4 years with mixed emotion. My sentiment remains the same but at least I have advanced far enough now that my compensation is on par with when I was a consultant. Dream of going independent again every day though.