Oh, yeah.
If they're rescues, means they may have some problems that will make them especially hard for new owners to handle.
This is what I've read on other bird forums. Some are described as being on the nasty side. The sad thing is that they are described as once being in a bad home situation (abuse, etc.) and now they're probably right back in a similar situation after being loved while in her care.
I was thinking the same thing. Folks see birds and go "OH pretty!" then they get them and discover they're loud, messy, destructive and require gobs of work.
So they abuse and neglect them. Or if they're humane, put them in a rescue.
~~sigh~~