Unsurprising
"The median hourly wage for older techies is £25, which is 14 percent higher than for IT specialists as a whole"
The average Tech is underpaid and over worked. Other professions in business don't get lumbered with the range of work some techs do. In the past as a developer i was also asked to fix things like paper jams in photocopiers or get headsets working. Literally anything that used electricity was fair game.
That never happened to other professions like HR, Legal or bean counting.
HR do salary assessments based on basic IT job skills and not on specialisation or value to the business.
Most tech people i knew go out when they hit the glass ceiling, myself included, and good, productive and knowledgeable people leave the profession.