I can see why some people are dismayed by multiple issues of Costello's back catalogue, but come on, nobody is forcing you to buy them all. And it seems to me, a keen collector of his work, that each issue has contained important new bonus material. And often overall sound quality has improved too. I wanted to hear the 1978 concert (I saw Elvis and the Attractions at the Dominion, Tottenham Court Road around that time). It's exciting, and worth the price of admission.
I hope EC continues to allow the release of material from the vaults for those of us who want to collect it!!!