Adopting a second, third, or forth hand bird should be for the more experienced bird person. These birds require a lot of time, patience and understanding of birds and their various signals. So although I think people should consider adopting a used or unwanted bird, folks should realize their limitations going in. It would help to keep the bird from being bounced around again once the new parrot parent realizes that the previous owners got rid of the bird for other reasons then just "we are moving and can't take it with us", "I just don't have enough time to spend with it or the bird".
I see this all the time on Craigslist, but yet there are loads of people wanting to adopt the animals if the re-homing fee is cheap or at least reasonable. But new parents fail to read the signs or signals put out by the previous owner such as "I just don't have the time to spend with it or the bird = DESOCIALIZED, "we are moving and can't take the bird with us" = YOUR KIDDING RIGHT, but yet if you check thoroughly, you will see that they are taking their DOG or CAT.
The main signs I don't want to see when responding to an adoption ad is for the animal bird, cat or dog to be referred to as IT or BIRD. This to me throws up flags that the previous owner has already became impersonal to the animal for some reason. So this can mean aggression, overly needy, noisy, sickly and so on.
So I'm fully in favor of someone adopting a second hand bird as long as they fully understand what they are getting into and how to avoid the pitfalls of the previous owner. If not, then buy from a qualified breeder, pay the big bucks and have someone who you can rely on for future advice once your bird starts growing and no longer that cuddly little chick you remember.
Mike