I say it will vary per person or household. People manage entire farms with hundreds of animals. If they have the means to care or provide care for these animals, that is wonderful! More power to them. There are some people that can't handle 1 animal.
I have 5 cats, 1 dog, and a handful of fish. We care for our animals the best we can. We can afford them, hell even when we were low on cash, they cats never went hungry. We wouldn't allow that to happen. We make sure they go to the vet when they need to. We plan to have more animals one day, but at the moment we are out of space. We'd like to get two more dogs, a snake, lizard, and frog. My husband wants a spider, but that is never going to happen. Not in my house.