Interesting subject I must say. It makes me feel quite fortunate to be flying a turboprop (ATR72) for £23000 per annum however, there is no flight pay so no extras can be taken home on top of that. Except for night mail when we get £10 after tax.
The potential for salary increase does exists in the industry through promotion or moving onto a jet however starting salaries are very low on most turboprops for people who have often spent over £60000 to get themselves there.
Where I live, I have friends who are admin assistants, nurses etc who earn almost as much as I do with no debt and many more benefits such as private health care and more leave. Obviously their salaries are unlikely to increase anywhere near as much as mine in the next ten years. However, it does indicate how low starting turboprop salaries (and lack of benefits.) tend it be in comparison to many other jobs.