Maybe no one is offering to sell them the drones. Also, the ones in "charge" probably don't want to be arming a volatile country like them with state-of-the-art defense/attack equipment. Hence why they're being sold old stuff more easily detectable by radar as well as the country still needing the assistance of the ones "in charge".
Yes, I think you touched on a few excellent points. Although it does seem that the US could ground the planes remotely if they were being used in a way that was not deemed acceptable. The command and control systems do flow through the US in the end. :p Thank you, as always, for commenting.