because it generally doesn't. Unless you change to sales or become a VP or something. If I had a title it would be 10 words long

they asked me to supervise an entire department, and asked me to do all programming and no QA, but still left me as a QA Specialist I.

because it means they don't have to change the company structure, while having someone do the dirty work.

It is all about payscale and keeping people inside the company from getting jealous.