The issue in any business withholding a service or a product is that the demand is not for that company, but for the product or service to fill that demand. By withholding, instead of killing the market, it encourages others to fill that demand. You find numerous examples of this across history. Such a move even led to the rise of a small Seattle based company called Microsoft.
NCSoft shuttered the game which filled a niche in the market, one not serviced by other products. The demand remains for a game of this type. We are only working to fill, and potentially grow, that niche.