Eighteen of your twenty professions are shift work. Twenty of your twenty professions have no hiring authority. Meanwhile, the average pay of a board member is between $100k and $250k, depending on the size... and "average" is a misnomer here in that it can easily extend to the millions.
For a part-time job.
That you can hold several of.
So. By all means, bring up "electrical power-line installers" (no roughnecks? I mean, there aren't a lot of women doing that either!) but let's not pretend there's anything approximating an equivalency here. After all, a dietician can directly affect the livelihood of - well, herself - while the thirteen board members of CBS are responsible for $21 billion in assets and 13,000 employees.
"Preschool and kindergarten teachers." ORLY.