That should be at the top. As bad as the free option is and as many people is complain about it, it seems to have a massive base that puts up with it.
They're not "putting up with it" though. That kind of thing is more what they want/have come to expect from developers.
When this type of game started, IMO the majority of the kind of people that sought it out were people who were in love with aviation and aviation history, with a few gamers mixed in. These days, the vast majority of the market for something like this is gamers. Completely different mindsets and expectations.
Wiley.