Talented parrots

A man walks into a pet shop looking to buy a parrot.
He sees three and asks the shopkeeper how much the first one is.
"Five thousand dollars." replies the shopkeeper.
"Wow! Why so expensive?" asks the man.
"He can sing the aria from 'Carmen'. " replies the shopkeeper.
"Well, how much is the one next to him?" asks the man.
"That one is twenty thousands dollars, but he can sing the entire Les Miserables." replies the shopkeeper.
"Ok, then how much is the last one?" asks the man.
"That one is One Hundred Thousand Dollars" says the shopkeeper.
"My God! He must have some impressive skills!" says the man.
The shopkeeper replies: "Actually he doesn't appear to do anything at all, but the other two keep calling him Maestro."