The observation of convenience gives pleasure, since convenience is a beauty.
Hume takes note of our natural esteem for the owners of beautiful richness. What is beautiful causes pleasure, obviously.
But after what manner does it give pleasure? … We enter into his interest by the force of imagination, and feel the same satisfaction, that the objects naturally occasion in him.
The possession of objects of beauty (Hume uses chairs, cars, and generally speaking technical objects as examples—objects of #design one may later say) is agreeable. With the faculty of #imagination, an observer sympathises with the owner of these commodities.
For instance: I naturally esteem the owner of a Barcelona chair or warm little house with generous windows and well integrated within its natural environment, because I find these objects beautiful and of good taste. By sympathy, I am inclined to like the person who owns such objects.
But the possessor has also a secondary satisfaction in riches arising from the love and esteem he acquires by them, and this satisfaction is nothing but a second reflexion of that original pleasure, which proceeded from himself. This secondary satisfaction or vanity becomes one of the principal recommendations of riches, and is the chief reason, why we either desire them for ourselves, or esteem them in others.
… and of ill-placed vanity when these possessions are of bad taste (a huge McMansion which is made of hideous and cheap materials, for instance).