The value of education and pay has not been in line for many years,  My
father looked for two years for work and was turned away as over-qualified
with a MA.  I earn more money part-time as a house-remodeler than as an
exhibits EE.
   The museum workforce is viewed as a slave to the non-profit mentality,
i.e. "Museums don't make a profit - WHY SHOULD YOU!"

And until there is a labor shortage - the pay will stay the same - in fact
- why pay?  Just use volunteers.