my boyfriend's not a rep or anything but he started changing jobs every 6 or so months a couple years ago and it hasn't heart him at all. His cell phone is always ringing, even late at night - he even got calls from Microsoft with some crazy offers to fly us cross country for job interview

I think changing jobs is not bad necessarily maybe the person just didn't like the place, co-workers, company, the boss. The last contributing a lot to switching jobs for many. Takes a while to find the perfect job sometimes