They're also available on CD's now. The value of hearing the old original versions (which the folks heard like that back when they first came out) is more of a historical and nostalgic value (which also gives them their collector's value, as some of the originals are worth much more than a more recent version on newer technology with a "cleaner" sound).
An analogy would be the priceless, faded, yellowing, original version of the "Declaration of Independence" vs. a fancy replica (below) which you can get at Amazon.
