I think it depends on the job. If it doesn't take advantage of your research abilities, then a freshly-minted PhD (without other work experience) probably won't be paid too much more than a M. Sc. (less than an undergrad is plainly nonsense, though). But if you're taking a job at a place like MSR or IBM Research, not only is a PhD essentially a job requirement, but the starting salary is typically around $130k.