Ha! Well, I remain impressed with DreamHost having hosted with them for almost 10 years now. The fact that DreamHost "let you know about (these) 'hacks', in the sense that they did not censor them when they were shared by other customers, does speak volumes about the kind of people they are.
That said, I think it then follows that none of us should abuse that openness by exploiting it in an abusive way. Unfortunately, this has already happened with the "add a subdomain" hack, where SEO fools automated the addition of thousands of pointless subdomains.\
This prompted DreamHost to add a CAPTCHA to the control panel that presents itself after "n" number of domains have been added to an account (breaking the utility of the, otherwise convenient and useful, code being used to add a domain programmatically).
Beware that something like this may be in place for the addition of users also (I would have put it into all the routines in the panel that could be abused in this way if I was coding it).