If you're purchasing signed merchandise for BC/EFA, you're getting something signed en masse anyway - it's busy work for the cast to do before they need to get ready. I understand stagedooring, to an extent, because of the personal interaction with the cast- the signature has more meaning because it's linked to a specific interaction.
But this? It's not personalized. It's not even personal. It's basically a product.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."