Reason #3: Not only do they live a long time, but they consume a LOT of your time.

Parrots are very intelligent creatures, and like all intelligent creatures they require a lot of stimulation. Staring at the same wall for 60 years with nothing to do won't do anything for the bird. Keep in mind that these creatures are flock animals that live in large social groups in the wild and… 

now that they are no longer in a flock of birds, you are the flock. Even though your bird may not have been trapped from the wild, they are fully programmed for life in a flock. You need to interact with your bird on a regular basis - for a significant amount of time each day. Can you dedicate this amount of time? Will you always be able to? If you ignore the bird they can develop lots of psychological problems, like feather picking or self-mutiliation or other obsessive habits. Will your bird still be a good pet once these problems occur?  Will you be able to deal with a half-naked bird with its purplish skin? 

On the other hand, the more time you spend with your bird the better they can become - but also the more dependent they can become. It's very, very, very easy to set up conditioning that you are not aware that can lead to problems like screaming if the bird is left alone. 

 You need to give this intelligent being the time and respect it deserves? If you can't do that, don't get a parrot!