Ed, Mondos are art prints specifically meant to be sold to collectors in quantities only limited by edition size. In this case, edition sizes of 850, all of which get distributed to collectors. 850 is a lot of posters in a market and the only thing that jugged the price peaks on them is the scandalous way that the later editions were handled, which in some ways could be compared to fraud, like when they hold the major portions back from sale, really just creating a situation where the edition size is 100 or less, until all the people involved start releasing the massive remaining quantity. in other businesses, it's called "price manipulation".
the only difference between Alamo's & Mondos is that Alamo is an actual theatre and will display the posters, but unlike actual movie posters, their editions are no longer meant to be used to promote the movies as much as to be sold as limited edition art prints (yes, they are only limited edition art prints). As an art dealer of many years, who only sold original illustrations & paintings & not prints of any kind (but did keep track of all art market forms, including prints), I can tell you that print prices in virtually every market eventually drop like a lead brick and become among the worst investments of any kind.
the prices on these posters are outsized for what they are in my opinion and in the future many of you who own them will be commiserating on what they are.