Ah, i suppose its both good and bad that they probably don't care for the fish themselves. If I had an amazing tank like some of the ones on that site, I would constantly be checking my fish and conditions. But, it looks like those homeowners are just looking for the pizazz of a big marine tank in their kitchen or living room and probably don't know how to adequately care for the animals, in which case the hired help would be the only thing keeping them alive.
I guess a thousand-gallon marine tank would be quite a job for one person, though.