You say that the world governments don't want people to know the world is flat, but why? All the money pooled together from the governments would have to go straight back out to stop people from knowing the truth. And also, world leaders where normal kids once, and believed that the world is a globe. Do you really think that when they become PM or President some guy comes along and whispers in his/her ear, 'The world is really flat, and were not allowed to let people know, oh, and we need another 2 billion to help hide this fact, even though we are in a massive economy collapse'. Even if they did, the listener would just laugh in his face. What do they gain from 'hiding' the truth that the world is flat? And what developing country, who needs money to develop, would give money away for a pointless reason?
This is a serious question, as I just have not got why they want to hide it.