its true this does work, which is why some other apps used this to gain revenue. ( Apple has since stated that devs cannot offer users ingame incentives to download other apps)
Apprantly it's because your creditcard company will not approve multiple purchases that have identical amounts. Wait a few hours and try again, worked for me.
you fail to read, I made the mistake of thinking that people would read the whole sentence. To the other person, I am not flaming you, I am just finding it incredibly hard to understand what you say. Proper grammar is very important in everyday life, especially over the internet when you are trying to get people to understand you. The comment about the PS3 was just me pointing out that it didn't relate to the topic. Here is an example, with the irrelevant information in bold. The personnal computer was a great invention that we all use almost everyday. Fire trucks are red.