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Expensive both in material and then again in the inevitable Anish Kapoor lawsuit: http://hyperallergic.com/279243/anish-kapoor-gets-exclusive-...

It's an interesting question though, as I would think that the use of Vantablack in the gallery itself would be a structural use, which limits Kapoor's rights. It's not being used in an artistic work directly, it's being used to highlight other artistic works. In fact, it would be about the only place Kapoor couldn't show any of his theoretical Vantablack work (to my knowledge, he has yet to exercise his Vantablack exclusivity rights). It wouldn't register as existing.

Probably not a good idea:

"Vantablack surface is easily damaged by any direct impact or abrasion". From [1]. People would be touching the walls all the time.

1 - https://www.surreynanosystems.com/vantablack/faqs

There are cheaper very black alternatives. Even flat black paint and controlled lighting could be a starting point to try it out.