It goes 3-ways. First people want to ensure the new owners can afford it. Second by charging as much as a baby/juvenile grey it usually helps deter people who want a cheap breeder or people who can’t afford to keep a gray in the first place. Another reason is to just recover some of the cost. That holds true for any of the medium to larger parrots. Greys are especially popular so it’s not an unreasonable expectation. Just the same as one sees higher rehoming costs for macaws, etc. The last reason of course is the worst one. People are greedy. As I said Greys are popular so people ask as much for the bird as they think they can get away with. Those people are usually the scammers though. The ones who say one price but all of a sudden you have transport costs, cage costs, insurance costs etc. Or they simply ask a ridiculous price to begin with. It’s sick and it’s sad because a lot of people have been taken in and lost money on they. Our vet told us someone lost close to $18k on such a scam. You say how is it possible? Some people are desperate and they don’t realize how deep they are until they’ve lost it all. I’m not against a reasonable cost for rehoming. I believe you need to be able to prove you can afford the bird (no matter the species) and it can help deter those looking for a breeder as well as provide a little bit of recovery for those who have invested heavily in their fids. I have now had Sif for around 12-weeks. I paid the initial price for her and the vet bills alone are close to $1000.00. So long story longer, there are valid reasons for rehoming fees just as much as there are scams for rehoming fees.
I can see the point you are making, but I know that it is possible to find a good home for a bird without expecting any money in return. Please bear with me as I go into some detail explaining my position and history with rehomes.
We've taken into the flock 10 rehomed birds: 8 birds from people either met at work and 2 birds from complete strangers. Of the people from work, one I did not know all that well, and he gave us Coco, a Hahn's Macaw. This person who gave me Coco fancied himself as a knowledgeable "animal person" and had horses, dogs, cats, geese, ducks and Coco. When I got Coco, I took her to our avian vet, and the vet said the bird had been severely injured. X-rays showed massive injuries to her scapula and most other bones down to the tip of her wings--injuries that had not healed. Coco could not fly. When I told the former owner about these injuries and showed him an image of the X-ray, he seemed surprised and said that occasionally Coco was left on her own with a cat and Coco would fend for herself--a clear case of negligence. I told the owner I thought it only fair that he pay half the vet bill. He did.
The other person from work I got to know well over for a 15 year period, and no need to go into that story, nor for that matter getting birds from friends of ours.
As for the complete strangers we got birds from, I answered an ad in Craig's list and saw that a woman was asking for a small sum of money, $400 I believe, for Sunny, a Blue & Gold Macaw We went to see Sunny and explained our history with keeping birds. We told her we took all of our birds to an avian vet at least once a year. The woman saw we that might be able to give the bird a good, so she gave us the bird. Money was not an issue for her, at the time it was for us. This woman later gave away her gray, Buzzy, to another family, and when that family no longer wanted to keep, Buzzy, the original owner referred that family to us, and the rest is history.
I hear a number of similar stories from people I meet at the vet's office and elsewhere.
There is a non-profit bird rescue/rehome organization in the area that takes birds, rehabs them, and then offers them up for a nominal fee to cover their operating costs, but most importantly, this organization requires that a person attend a multi-session class covering the responsibilities of bird ownership before giving a bird to someone.
If, heaven forbid, we had to give up one or more of ours, and could not find an organization similar to the one above--and I believe there are many--then it would only be if that person were seriously vetted.
Having money or even knowledge does not guarantee someone will be responsible. Having a successful history caring for birds is, in my opinion, is the best guarantee that someone would care for a bird. There are an abundance of organizations as well as parrot forums like AA that have many motivated people who have the desire to care for birds.
It's fine to say that there are many people who abuse animals, I believe a responsible parrot owner can minimize the danger to a bird in a rehome situation. The onus falls on the parrot owner. How do you make people responsible? People are not perfect and make mistakes and birds suffer. There are no easy answers. I know I would feel like I am devaluing a bird who has been in my flock if I were to ask someone to give me money for caring for that bird. Seems to me like it should be the other way around.
We're setting up a trust fund for our birds so that when we're gone, our birds will have some security in their future.