I kind of agree, sort of, but ...
isn't what you're saying that the number has to be small enough for collectors to consider them valuable? So in a round about way you said what I said, that unless the number made is less than the demand the question of limited edition is irrelevant or misleading. Does the number 500 (or 100, or whatever) really matter? It's simply a supply/demand issue, just like any investment.
That's my 2 cents.