They're like people beds but for pets.
Shakespeare, upon his death, left his wife his "second-best" bed. To your pet, a pet bed will always be the same. Not because this bed is uncomfortable (it's not) or ugly (it's not that either) or somehow wrong (there's nothing wrong with these pet beds) or anything else. To your pet, this bed will always be second best because it isn't your bed. And face it, your bed will ALWAYS be the prize.