As for renting it. Movie rental stores make all of their money from new releases. As a result, the collection of older movies lacks a lot. You may not find a lot of movies that are over 3-4 years old. 80s movies will have to be very very big hits for you to find them.
^No, not necessarily. It's because there's people crazy enough to pay that much for a dvd and sellers who know they can take advantage of this.
If you happened across a copy of this movie, wouldn't you try to make a profit?