system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40000] What is life like, in general, for a mid-level noble on a Hive world?

Assuming they live in the "middle" of the spires and nothing exceptional special in any way shape or form other than being a member of the upper class.

*  How privileged are they?
* What do they do day to day?
* How wealthy are they?
* How are they treated if they go off-world?
* What can they afford easily, not so easily, and very rarely?

And so on.
gpt
As a noble, even a low tier one with maybe a couple of holdings and a modest compound in a relatively nice part of the hive, you're pretty well off. You don't really have to work *that* much aside from the occasional visit to your mine or factory or whatever to make sure the peasants aren't shorting you.

You can go about your day without being harassed by the local law enforcement, you've got enough money to do just about anything you want, which usually includes boozing and "studying" (read, boozing with friends in the proximity of books, unless you've got pretensions of intellectualism in which case, probably talking about *not quite heretical* texts), collecting an assortment of weird crap, and general idle rich behaviour. You probably blow more money in a day on little cheesy things on sticks than the middle class will ever see.

As a mid-level noble, you'll probably be attending the endless stream of social functions, dutifully snickering along with whoever you throw your lot in with that's higher on the social ladder and occasionally covering for their indiscretions, be they romantic, criminal or social. If you're smart, you bow out when the inquisition shows up and you get to live and possibly take their place.

If you're going off world, you may have been granted a do-nothing title by the governor due to familial or social obligations. You'll probably be wined and dined but likely condescended to by the local nobility.

If you're in a collecting mood, you'll probably have some decent copies of whatever your interest lies in. A second generation copy of a Mars Pattern duelling sword, a good print of devotional artwork of the Emperor and his Sons, what have you. If your tastes run to the more heretical, well, you're likely going to get noticed because you probably don't have enough money that, say, a Wraithbone pendant wouldn't cause a noticeable fluctuation in your finances, and boy do the Administratum and the Inquisition have some good accountants. On a more practical note, you'll probably have a decent sized household staff, likely a *quite small* warp capable vessel and probably a fairly high end Air-car.