You think you are making a devastating point, but you are not. First as to the promiscuity:
Thus she engineered the marriage between Nathaniel and Barbara Branden, even though (according to Barbara, in The Passion of Ayn Rand) they weren't all that attracted to each other -- their unease was "irrational" to Rand. Then she decided that she and Nathaniel should have some sort of "rational" love affair, like characters in her novels. That Nathaniel was not comfortable with that, especially since they were both already married, does not seem to have mattered. When he finally refused to continue their relationship, Rand furiously expelled him from her "movement" and then scuttled the "movement" itself.
Add to the above:
In another incident, related by the columnist Samuel Francis, when Rand learned that the economist Murray Rothbard's wife, Joey, was a devout Christian, she all but ordered that if Joey did not see the light and become an atheist in six months, Rothbard, who was an agnostic, must divorce her. Rothbard never had any intention of doing anything of the sort, and this estranged him from Rand, who found such "irrational" behavior intolerable.
Add the two incidents above together and you can see she was an extremely selfish, extremely disturbed person who thought of others as their personal playthings rather than as individuals. This of course is reflected in her overall philosophy.
I asked Patrick this question, and he did not care to answer it, I now ask it of you and anyone else here: what is moral about her philosophy of selfishness?