Most diploma holders in public service suffer when it comes to increment. My wife (who also has a diploma) joined a stat board in 2005 and by 2010, she has gotten only $500 raise. Compared to me, I joined public service in 2005 and by 2011, i've gotten almost $2000 worth of increments.
She quit her job and joined private... a bit more pay but super less work... both happy