“The real question is why they aren’t sticking with one type of aircraft?”
When you buy weapons from a company you are also buying an inroad to their lobbying arm. Perhaps the real reason has less to do with weapons and more to do with politics.
Quite right. Also it appears Qatar is buying training. That is regularly done in the country selling the aircraft, at that country’s armed forces’ training facilities, and by that country’s armed forces’ personnel. It is another huge point of access and network building.