If you cannot see how this level of compensation is absolutely ludicrous then you are not debating in good faith. Any able bodied person in fair shape can be a lifeguard with minimal training, been there done that, had my cert as a teen. This is not a highly specialized field.
Funny how people here have a huge problem with CEO pay but don't want to acknowledge that $400,000/yr is highly inappropriate for a lifeguard.
I have been a lifeguard and a swim instructor as well, I was for most of my twenties, so:
1)I’m going to posit it’s been longer for you than me since you were a lifeguard. I’d also bet you weren’t a municipal one for a large city. The level of training given in this end of things today is much higher than it used to be for folks in those roles (you also don’t know if these roles for the non-mgmt end of things included things like swim instruction).
2)Lifeguard’s literally keep the beach safe, paying a decent wage for people who will build experience on how the tides shift on their end of things, how the population around them swims, what hazards to look out for specific to their beach or facility is worth it. For that matter paying a decent wage for any work is worth it, and OT is time and a half usually so it adds up.
3)I would bet that the cost of living where these guys are is much higher than where you are, so wages that may seem high to you are not necessarily all that high, and again, OT can build a lot if base pay is decent.
4) most importantly to the specifics here you seem to keep deliberately ignoring the fact that almost all the people earning anywhere near that much are management, and mostly not low level either, not the base string lifeguards, that is not a set of jobs that can be done by “any able bodied person in fair shape with minimal training” and pay is higher than a base lifeguard so OT will add up to more even more quickly
to keep this on topic: unions make sure people get decent benefits, as these lifeguards get, if you’re salty that you don’t those benefits the answer is to union up like the Apple store did, not to complain that because things suck for you they should suck for everyone, forever