It sounds like you're describing idle-rich people. Which makes sense.
Yeah, if you're "rich" as in "retired", your life is usually pretty mundane. Most such people don't even live in any kind of mansion these days†, but rather just in very nice homes that are perfectly-sized and perfectly-cozy for them and what they like to do — with some verrrry long driveways, if they're in the right part of the country for that.
† (Mansions as a concept evolved from palaces; both exist mostly to provide enough rooms to host guests when some other rich person decides to pilgrimage themselves and everyone they know over to your place to stay for three months — in turn because that was really the only good way to visit someone with full amenities, back before air travel. Nobody needs to do that these days. Any modern mansion exists either as a status symbol, or because the owner likes hosting parties [or imagines they might one day host a party, but never actually does]. Mansions are especially useful, in the modern day, for people who throw fundraiser galas, like politicians.)
> Maybe some nerds in silly valley like to larp as 1800s rich people with actual large numbers of staff, I don't know,
I don't think it's SV people doing this. (The SV entrepreneurial "grindset" is a form of protestant work-ethic mindset; most tech millionaires find it hard to allow themselves to have staff. They might have a lot of people on retainer — lawyers, personal trainers, private-practice doctors, etc — but they would find the idea of paying the full salary for the exclusive use of even a maid to be a bit strange, instead preferring to just "hire a service" for that. Right up until they have a security scare, that is... but I digress.)
Rather, the personal-staff (private chef, limo driver, landscaper, several maids, etc) setup is, these days, something for the busy rich — think "runs ten businesses because they don't know how to stop", or "has an infinite queue of people needing them to make a decision about something" [politician, chaebol owner], or "thrives on fame, and so can't stand to turn down packing their schedule with ever-bigger gigs" [celebrity actors]. You find it in LA and in DC, not in SF.
These groups "have people" because they literally wouldn't be able to fit self-care into their schedule without "people."