The sliding scales of inviting all the people you want to have there and avoiding people getting pissed off if they don't get an invite (or similar political reasons) are only limited by the financial means available.
100 is a relatively easy target to reach for most people. Family and friends and their +1's and children gets you there pretty quick.
Cannibalism hasn't been proven yet. But even without that, rich people not getting punished isn't mildly infuriating. We are way past that.
And the world was already shit long before we learned about any of this. Because it was possible to get away with that shit before we found out and even still after we learned a little about it.
Billionaires aren't the majority. Turn your morose mood into a political movement that will hold them to account.