Destroy All Monsters

OK, so over the past few years, I've begun fashioning a modest collection of Godzilla movies. Now, every so often, if I get some overtime, I say to myself, "OK, suck it up, do this, and you can get a new Godzilla movie or two." So here I am, having just completed a 12 hour overtime shift, looking for a new Godzilla movie, and the next one in line is: Destroy All Monsters. I pop onto Amazon, and my jaw almost hit the floor...$100? For a Godzilla movie? Now, economic sense tells me that it's a supply and demand game...but how much demand can there really be for a 40+ year old movie? I assume there must be something else, driving the demand and the price up for THIS particular Godzilla movie, as opposed to other movies, which typically go for around 10-12 bucks. But I haven't the foggiest idea WHAT. So does anyone know why people are gaga over this movie? I don't get it. Not a huge deal...I have plenty of other holes in my collection to look at, but a hundred bucks for ANY movie would make me think something was up...