Thanks for sharing your thoughts and definitely entertainment is not the only criteria for selecting an airline for travel! I would also like to understand your criteria for choosing an airline for international travel.
On the Cost of development and returns, it is a good way to check but not the effective decision making tool as it doesn't include one important parameter which is human behaviour. As humans we are expected to behave very rationally based on which many decisions are made and then they fail. In Airline industry specifically, you can see examples of it. This is an industry that is long due for a big disruption to usher back the golden age of air travel especially the international ones and I believe the Gulf based airline carriers are capable of doing that.