That's the issue with Kell. He's often too fast to see flaws and faults in a thing that prevent him from enjoying it. He does not recognize, as she does, in addition to the original reason for creating all this opulence, it gave many people chance to exercise their craft, realize their visions and get paid for it. Kell's not yet good at seeing more sides to things than one.
But he notices, she's enjoying the show so it helps to shoo away his discontent with the greater picture of the celebrations.

Kell makes a face, an mock expression of deep contemplation. He's not the greatest actor, but even if he was a star performer, the sparkling amusement of magic swirling about him would give him away to her immediately.

"You put me in a difficult situation. Should I be a gentleman and rescind my right to cake? How then would I know if this is any good?"