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It seems to me that the things that are collectible are those associated with pop culture and have some decorator value, or things that the 30-50 year old crowd remember as fun from their youth. The projection sets, especially the type you use with a seperate screen would have been industrial or institutional items and not seen so much as a "fun" item.
Just like a 1957 Chevy Bel-air might have a lot of collector value, but a 2 ton truck or school bus from the same year really doesn't and would be a lot cheaper...even if they may be rarer.
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