Well, as someone who do earn £120k as a Nanny,
am I overpaid? I would say anyone on £100k+ is usually overpaid in comparison to most other jobs (irrelevant of the jobs one does unless potentially jobs in which people either save lives or risk their life). That being said, I am paid £120k+/year in exchange of accepting to have no life of my own. Most people wouldn’t do that even if offered that price.
Many women at that salary range in this profession who have been doing it for a long time, end up at 50yo+ not having had their own kids or ever having gotten married because they dedicated their life to somebody else’s children and family and never had enough time off to build a life of their own.
I earn £120k+ because I work unsociable hours, have to deal with very high expectations and constant last minute changes and requests, and usually have very little time off, etc…
If you divide my salary in the amount of hours I work it wouldn’t feel like I am actually earning that well.
I do agree that most childcare professions are incredibly underpaid and that’s unfair. Having a nanny is a luxury though so I don’t necessarily think having exclusive care of your children, at your home, tailored to your schedule and needs should be cheap. I personally that if I asked for a raise I would get it because the family I currently work for sees the value in my work and doesn’t undervalue what I do and they 100% grasp that I am a big portion of what allow them to earn as much as they do and to work as well as they do (they don’t have to worry about childcare, they don’t go to work sleep deprived, they know if there is an emergency I am abilited to cope with it and sort it without normally needing them to drop everything last minute.) It’s a luxury to have that peace of mind and they know it and so they happily pay the price tag that come with it.
The Nanny market is a free market though, Nannies can ask for what they want and you can offer what you wish. Nobody is forcing you to pay 50k for a nanny, I have worked to the same standard (my standards of work are unaffected by my paycheck) for way under 50k, and I would do it again if a family valued the work of a nanny was in need but couldn’t afford it, but I would never work for a family who thinks Nannies have an easy job and that they shouldn’t be paid much more than peanuts for it as a result.
Treat your nanny like you want her to treat your kids is usually my advice. If you expect the best care for them, give her the best package you can afford to give her, if your only criteria is that they stay alive and everything else is free game then by all mean go ahead and pay the minimum.