What would you guys do if you had obtained Regulus's Authority of Greed?

Me, personally - I would do the same things as him.
To the letter.
I would rant to people for hours about myself, my nonsensical asocial pseudophilosophical remarks, and they wouldn't be able to do anything to me, because the authority makes me VNBOTHERED.
Of course, I could also kill anyone I want to with a swing of my hand.
But why bother?
Being able to obsessively ramble to someone for days on end (I wouldn't need to eat/drink/sleep because of the authority) would be a far better way to get back at them than time-stopping my fart or smth to use as a lethal projectile.

I would also acquire a harem of women with
pretty faces.

And yes, I also wouldn't ever have sex.