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What makes them hold no $$$ value? They're "run-of-the-mill"? Not in good enough condition? Not old enough?
The prices of stamps are determined, like anything else, by supply and demand. The stamps you have were printed in large quantities and there aren't all that many collectors today who collect them. Most of those types of stamps regularly turn up in "penny packets" today. Even some stamps 130+ years old were printed in such large quantities that they're basically worthless today. There's really no hard and fast cutoff date between valuable and worthless stamps, but the majority of stamps that are worth much of anything are from before 1950 or even 1900. There aren't many stamps, percentage-wise, issued after about 1950 that have real world values of more than a a few dollars, and the vast majority are worth just pennies.