Well, I agree about there not being a very large market, but I don't think that it would double develop time. In fact, on most of the development projects I've worked on that were multi-platform, developing for *nix-based systems, such as Linux or Apple OS X, took much less time than then design, development and testing for Windows software. If you were to take Linux out of the equation, developing for Apple computers is much easier - the development tools and graphics libraries are much more mature and stable, and Apple has the advantage of the operating system and hardware all being meant to specifically work together as one unit. That's a big contrast to Windows pc's, where the operating system is made by Microsoft, but the hardware is from many different vendors. Developing and testing Windows PC's is a much more lengthy process, at least with the projects I've been a part of.

That being said, this is an RC Sim forum, not a software development forum, so I'll let go (can you tell this is one of my favorite topics!). With the graphics performance and wide-screen on this new Apple computer I purchased, it would make for one heck of a flight sim! Hopefully someday we can get there!