Surely there's nothing (drug use aside) that's legally actionable about this. The encounters seemed consensual in the sense that the women weren't threatened or forced and were told about what the drugs offered would do.
If there's not any legal wrong doing then is it social misconduct? Somehow it feels wrong for me to judge or condemn adults for their sexual conduct - even if it seems cheap, transactional, and gross to me. I understand different people have different values and preferences, so why should I apply mine to them? Furthermore, I can't imagine that finger wagging from the likes of Vanity Fair is going to make these rich young men give up on their drug fueled sex parties.
It's an interesting article, even though the author is decidedly biased and at times intentionally misleading (e.g. when she scorns the idea that there are some/many women interested in taking advantage of men, in the middle of an article about rich nerds finding themselves suddenly with a surfeit of women). I don't understand what is supposed to be done about this though or even if something should be aside from educating young women about the tradeoffs they may make in these environments.