Many of the titles they include in these sets are out of print on their own.I have over a dozen of these sets (as well as the Warner version) and really enjoy them. Most of these sets come with 5 albums for around $20 which is cheaper than buying them all individually if you can even find them.
It’s also an inexpensive way to replace old vinyl. The “point” of these releases is to provide a chunk (or in this case, all) of an artist’s catalog to the casual “greatest hits” fan who decides he wants to dive a little deeper.