Has development cost ever been the issue that prevented the addition of an aircraft?
Yes, always. Cost in $ and time (which translates to $) is considered in every business decision. If these aircraft were free HT would have them all implemented by now.
HTC continually adds new aircraft for no extra charge. You would prefer the players with deep pockets to decide what is added next? How is that a good idea?
It was only a question. But even if it was an idea, the OP never said that "that" would be the only way to add new planes so don;t worry, them deep pocket people will not decide anything
