I would like to one day open a sanctuary/zoo that takes in abandoned birds, shelters them, and displays them to the public (along with exotic bought birds from across the world). However, I do not know how much or little this type of place would be in demand. Please let me know what you think and why or why not you would go.

People love that sort of thing where I'm from, especially if it has a local feel. And just like many wineries around here have tours, so do many organic farms (which have animals). People are so proud of nature in my community, it's one of the reasons I love living here, in Pooploops. ;)
Good Luck:D
I'm not the biggest animal person, but if it looked interesting enough I would probably go. But I do love your idea of taking in birds and giving them a sanctuary!
Good luck! :)