Don't go betting the farm on that. As any economist will tell you, the principal driver of value is
scarcity. For these things to increase in value by very much, there would have to be relatively few of them.
Take Star Wars bubble gum cards for instance. I once found a shoebox full of originals, a complete collection in excellent condition, from 1977 or '78. I thought I'd found a gold mine. Then I went on eBay and priced them.
The entire collection was worth less than $5 (five dollars, not a typo), because they sold millions and millions of them back in the day. Everybody and his brother has at least one set.
So what do you think the odds are on these phasers ever becoming hard to find? How many of you have already bought more than one? China's not exactly known for producing small runs...
Also, prices are set in the marketplace by what people
actually pay for goods and services, not by the prices they're offered at. Another example: how many of those $1,500 MR phasers do you actually see
selling at that price? How many $1,000 communicator kits? I've never seen a single successful auction at those, um, optimistic* prices, and I've been watching Trek items for years and years...
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* Optimistic: adj., 1. A polite Internet euphemism for "fµ©ktarded."