And therein lies the problem. You can't simply go out there and make a game just for the "hardcore simmers" and expect it to sell well. Even if there are no bugs, and everything else has the perfect balance (ie graphics to performance), if the game is so complex that you can't sit down, and in a few hours, have at least a basic understanding of what you're doing, then the sim simply won't sell. While it may certainly appeal to those hardcore simmers, they represent a vocal but small fraction of the market. They just can't support the market by themselves.
And that is what makes modeling sims so hard. You need to be able to dull it down to make it fun for beginners, but also be able to up all the settings to ultra-realistic for those hardcore of us. That, I think, is why there have been very, very few complaints with the Microsoft FS series. It's got all the abilities of real flying, while also being able to dull it down and let some noob going blasting through the sky at Mach 2 in a 737. And it's got eye candy to go along with it. Now, granted, it's not a combat sim, but it illustrates the point.