There's also an incentive for them to make buildings as large and as expensive as possible as they it affects their income. Certainly I'd argue self interestedl

There's also an incentive for them to make buildings as large and as expensive as possible as they it affects their income. Certainly I'd argue self interestedly that all living quarters should be as large and extravagant as possible as I'd like to live in a large extravagant place. But, millions (billions?) of people are doing just fine in much smaller places than these self interested architects are suggesting.