This has been answered already:
Since we gets payed by Cloud9 (even now) because they licensed our sales system to sell KLAX, we can't obviously compete with them with a similar product, on FS9. And yes, Cloud9 KLAX is still selling, and reasonably well, considering it was released 3 years ago.
Since FS9 right now is still (unfortunately) about 40% of the market, we can't afford to dump it, yet. We WILL, sooner or later, but we can't right now so, why would we release a scenery which would start immediately with a 40% sales loss, ( because we can legally do only an FSX version ), when we could release an all-new airport, for FSX and FS9, that doesn't start with this handicap ?