Alison, I agree with the others in following your instincts. I also found his message suspicious and agree that his response was revealing.
When I adopted Victor, his previous owner chose me over another prospective home that was large with a huge aviary and a wealthy owner. Her reason: Victor requires a lot of attention and she felt the other guy just wanted him as a "showpiece" in his aviary. She didn't think he would get the personal attention he needs. She wanted Victor to have a "home".
This email was awfully impersonal and my gut tells me that a showpiece is likely the motive here as well, if not worse. Not what I would want if I was in your shoes. I think you did the right thing.