State officials and airline executives say the airliner spends about half its time on the ground undergoing maintenance, and can fly only about a third as much as foreign-made rivals in a 24-hour period when in use.
They blame a lack of readily available spare parts and the complexity of servicing its engines.
(from up_down_and_out's link)
Even if the two crashes are unrelated to the aircraft, if it takes that much maintenance and can't average at least 8 hours/day utilization, no one's going to want it regardless of how cheap they can sell it.