DO NOT go for a PhD if you don't wish to teach and/or do research in a university. But if you still go for it, complete it and do not expect to get anything in return, just because you have a PhD. Also remember that, after a 4-5 year industry experience, if you want to teach, it is extremely difficult or at times impossible to get into academia. This is all from my experience.
A Master's degree is good enough for industry.
PVM, PhD