@sardonicsmile People who are buying jets have a higher opportunity cost. Sure, they can try to haggle it down, but will they haggle it down by enough to justify the time cost?
That said, selling to rich people might be easier, but selling to corporations is a pain. You are selling to non-rich people, who are in control of large sums of money, in a highly political environment where their every decision is likely to be attacked.
@Mongoliaboo I agree with your premise. They are trying to maximize their tim/efforts.