Just saw the last reply before mine, Ian...
Let's be honest. How many here at SZ actually have TWO of everything they gig with? You, and who else? Darn few, I'd be prepared to say.
You have to remember, MOST of us have to pay store price for our gear, we don't get discounts for being demonstrators or dealers. Two S900's is STILL beyond the reach of many, even regular gigging pros (got a better use for a spare

$1600 plus tax or shipping!).
I just get a keyboard built so well, with an ATA flight case to protect it, that I don't HAVE to worry about needing a spare!
MOST of us gigging for a living don't have two of everything. Donny got ONE SD1, Fran got ONE G70, zuki got ONE of each of his arrangers. It's a rare member here with TWO of anything!