Do Heritage stay relevant when they are old?

I see hobby boxes of past years for Heritage discounted. Is this just a fun "while current" set, or do any cards actually hold collecting relevance the next years?
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ive been looking into picking up the old Topps Heritage sets (just the cards in the set, no inserts) and they are not listed much on ebay, and when
they are, they are a few hundred bucks!
WTB: PSA 1 - PSA 3 Centered, High Eye Appeal 1950's Mantle
My collecting blog: http://ctcard.wordpress.com
WTB: PSA 1 - PSA 3 Centered, High Eye Appeal 1950's Mantle
Dave
Collector of Vintage Golf cards! Let me know what you might have.