Competition is what makes this game interesting and some people want limitless sandbox and consider those who are better than them bullies and unfair. They need reality check, because that's not the way the real world works, and I don't know why would a game work that way either.
Nevertheless, as a business simulator this game should be more restrictive, profit margins now are far too high, risks too low and fleet counts and valuation of some companies enormous, not only because of spamming and scamIFS for huge top airlines but for "realistic" smaller airlines as well.
BUT if the game were harder, it means it would be harder to stay above water for everyone. And there would be even more whiny individuals who couldn't cope and are annoyed by someone doing better job than them. -.-