My husband and I bought a large country house just before lockdown happened. We have about 10,000 sq feet (10 bedrooms, 9 bathrooms - 2 of these are only cloakrooms, 2 kitchens, 3 sitting rooms of different sizes, 2 dining rooms, 2 utilities, and then a number of other random bits), and it's just us two plus a dog and four cats. We also have a range of outbuildings and a small cottage on the property.
For us, we bought it because we fell in love with the feel of the place and with the idea of keeping it safe and sound for another generation. It's a total money pit, it's always super cold (it's about 14 right now - I'm wearing a hoodie, a jacket, fingerless gloves, slipper boots, and sitting under a throw as I type), and things break or leak pretty much daily - but we love it here and we pour lots of energy and love into looking after it.
We hosted our wedding here, we regularly have large house parties where all of our spare bedrooms are full, our parents come to stay with us regularly (sometimes at the same time)... Also, the wing can shut off into a full four bedroom house including kitchen by itself, so if ever either set of parents need to move in with us, they are future proofed.
We have a little help - we have a cleaner 10 hours a week and a gardener 8 hours a week. This is mostly paid for by AirBnB-ing the little cottage, which I clean and manage myself on top of my regular job (the time cleaning and managing is less than the time saved by paying for the help).
I do have to accept that we will never be able to afford all of the many projects we want to accomplish in the house, and that we'll never be done decorating, though! But all in all, I'd not change a thing about it.
Also, for those who suggested big houses are status symbols - that may be true in some cases, but for others, it's a lifestyle thing. If you saw either of us in public, you'd think we were the scruffiest people going - I usually wear my husband's cast offs, my hair is usually going all directions, I'm often covered in muck from chores, and both our vehicles are 15+ years old! We are not flash people - we just love being custodians of this special place. :)