Because their Wizard book told them to. The Wizard interpreter told them about it on Sunday at the house of the Wizard.
1. George Michael was a fucking legend. But 2. Billionaires could be doing this ALL THE TIME (and for more important things than IVF, quite frankly) without even feeling a dent. The fact that they don't proves that they are psychopaths. I mean, if I had that kind of money I can't imagine a way to spend it that would give me more pleasure. Who doesn't want to be secret Santa? Answer: ACTUAL billionaires. Fuck 'em.