Conjuration magic. That would be a curious experience. In the end an entrancing experience is more valuable than gold to a Durant. That doesn't stop her from pushing for more. More than just a single experience. She wants to get everything she could possibly want. In this case, that's an answer.

"Why? This is your party. Your celebration. Your moment. Why do you want me to do this?"

She knows why. Or thinks she knows why. But the why she thinks she knows, the why he tells her, and the real why may all be different things. Better to know two of them than one.