The big name stuff is important work, but there's also so many more obscure titles worth investigating that really provide a snapshot of free improvisation at a point in time. And he was generous enough to discount these titles to very low prices to where you could investigate a lot of stuff you may not have had the mettle for at full price.
A whole other can of worms there, but it's something I've often wished other prolific labels in this space might do with their back catalogs as well.