It really depends on what your expertise is. I work in sales part time, but I work in a field that I'm extremely knowledgeable in. I also work on commission which I think is a huge part of working in sales. It's a somewhat stressful job for the fact that upwards of 75% of my job income is based on performance on how well I do.
Some of my family do work in a lot better paying industries than I do, and they make a nice living for someone here in Canada. If you want to PM me to discuss more feel free!