Honestly, I think the answer will always be based on how many you already have. If you don't have any, chances are you're going to want more, if you have a lot chances are you're going to want less.
I love my brother, love him to death but sometimes I want another brother. A brother that isn't as rude as he can be, that would stick by me when I need it the most.
I'm not saying my brother doesn't stick by me, it's that sometimes I'm not sure how much I can trust what he's saying to be the truth. I don't know if he means to or if it's out of habit but I know that he tends to lie quite often. I'd know. I'd caught him in a few. Obviously if you're going to lie, make sure there isn't any way to check the facts.
I guess in my head, I want the "perfect" brother but you never really get that, do you? Nobodys perfect, you have to learn to excect people for their flaws.