I don't want to crash your party guys, but has anyone considered that payware developers offering Cessnas are basically making money with Cessna's products and brand name, even if "only" in digital form?
Doing freeware models could still be interpreted as enthusiasts bringing their favourite aircraft into their favourite sim and some kind of good advertisement, but payware is, badly put, copying their product and selling it without consent.
It is understandable that Cessna wants to charge "licensing fees" for this. After all you're not giving your product away for copying for free in the real world either, do you?
What would be cool to see though is kind of a teaming up between payware developers and aircraft manufacturers. E.g. the aircraft manufacturer helps the dev out with information and photos, drawings, etc... and offers some kind of "quality" control while it gets a share in the money made from the sales.
This way, you could have "Approved by Cessna" products which are of the maximum quality possible within simulator limits.
This seal could also turn out to be kind of a sales booster, since hey, you're having (almost) the real deal in the sim!