Mild objection: Ayn Randian types - such as myself - do not necessarily think that a company can "do whatever it wants." We just recognize that it is their property, and we did know this going in. I will go so far as to say that the serious and most successful approaches to resolving our issues are ones of which Ms. Rand would have greatly approved - namely, the early efforts to find a buyer or to put together a buy proposal; TF Hail Mary; and the successor-game efforts.
Each of these is firmly rooted in principles wholly in line with objectivism: We, as a community, see value that the current owners either do not see or do not want, and have attempted first to enlighten them, then to find somebody who will share the view and will see enough value to make NCSoft willing to give it up since they don't want it anymore, and then, if that fails, to put our own sweat and tears into filling the niche wherein we see this value.
Rand's hero in Atlas Shrugged, Hank Rearden, refuses to sell a product he owns: the patent to a new metal formula that the book tells us is stronger and lighter than steel (and apparently uses copper as a primary component). One might try to draw a parallel to NCSoft's refusal to sell CoH's IP, but one would be mistaken. Rearden, like Tony Stark in Iron Man 2, refuses to sell his property "because it's [his]," but also because he wants to see it USED. He sees value in it, and he wants to exploit it. (In Rearden's case, the express purpose of the buyer - the government - wanting to buy it is to make sure it's never used.)
What is ethical, to a true Ayn Randian, is to respect life, liberty, and property. To respect that one who owns the property is the only one who has a right to decide how it is used, so long as he is not using it to deprive others of the use of theirs. It is not ethical to demand another use his property in a way to help you; you can only demand inaction of another without impinging his liberty, not action.
What is moral, to a true Ayn Randian, is to use your life, liberty, and property to seek excellence and exploit one's resources to produce more excellence. To give of your productivity in exchange for value you otherwise could not have, but only with those who will pay for it of their own free will. In this, you enrich yourself with that value you couldn't get otherwise and them with your product they valued more than what they paid you.
What NCSoft has done is ethical, but stupid. What they have done may, to a Randian, be immoral, depending on why they did it. (We've been told there are legal issues at play of which we know nothing; NCSoft may, to an extent, be a victim here. They have not handled themselves in a responsible fashion wrt trying to deal with their customers, so "may be a victim" doesn't absolve them of that, but it might mean they weren't "sinning" in an objectivist sense.)