You could argue they are happy to re-release stuff several times without any added value in terms of rarities because the faithful would buy it.
I would go as far to say that some Maiden fans would even buy turds in the shape of Eddie, but that merchandising side of the band has kept them going for a long time. As a fan of their music, I’d rather have them as a live entity than not, so if other people want to buy shit because it has Eddie on it and that keeps the brand going, thanks for your effort!
P.S. A 40th anniversary is a ruby one (I must admit I had to google that). Maiden have missed a trick by not releasing The Rubies of the Beast in 2022, Piece of Ruby in 2023, and Rubyslave this year.