Yes, although you do need to interact with them if you have them singly, as I do, as they are very social flock-oriented animals. I talk to, sing at, and play with this bird every day for a good while and feel very guilty if I don't. He was alone last week for an entire day and was so happy when we came home. He first buzzed our heads to punish us and express disapproval for abandoning him, then he was extremely playful and interactive. We move his cage around the house to have him in the same room we are occupying and he eats when we do. When I take a nap in the afternoon, so does he. It's pretty funny to wake up to see a little bird with its head tucked under its wing, sleeping. When I move, he stretches his legs and wings to rouse himself.
They don't cost much to feed, but like all animals, vet bills can be pretty expensive if they get sick. A good avian vet is hard to find, although we have some brilliant ones about 45 minutes away.