Oh, come on! OS4 has been a pure pro bono development project for years. A hobby. So don't suddenly try to add money to the equation; since those doing the developments are doing it free of charge anyway, it's more a matter of what they spend their time doing. They could work on PPC, or they could work on something else, and the cost would still be $0. But the thing is, on x86 they would at least have *a chance* of reaching 13,000 sales (but still highly doubtful). With "X1000" I'd be surprised if they reached 130.
Are you suggesting the Frieden brothers have been working for free of all along, how could you possibly know? The figure of 130 sales seems a little pessimistic, a recent survey on Aw.net shows 275 members intending to buy the X1000, and of course this doesn't include others from non english websites or those that never participated in that particular poll.