When you look at the cost to develop a state of the art simulator, the price is not high. There is a HUGE amount of time and effort involved in developing something like this, and the cost are HUGE as well.
The result is worth it though IMHO. FS-One is state of the art.
BTW, it supports multi-player as well. Noticed above that the impression was it didnt. Not true.

I've been spending a lot of time flying, tweaking and working on some final features for the release, and I have to say I get more excited about it every day.

I've found that FS-One is so realistic, I can actually use it for real practice, not just learning stick movements for maneuvers. I did a recording of various snap rolls in IMAC routines and played back wit the stick movements on the screen. It acts exactly like the Real model (my Ultimate in this case) .
It was amazing, it was like a real time demonstration of my "Art of The Snap Roll" article that was in MAN. Point being, it flies so real it will change how I practice in the future.

Yes, we will do add-ons on an onging basis to support it. I donthink we'll have a Mike McConville Add-on, but there will sure be models etc in there for everyone, plenty more aerobatic models included.