Hey @hpoonis2010
I'm sorry to hear your question hasn't been answered before, though, I'm not sure this is something I can give an answer for.
Are you asking this as to report it as a bug, where you have seen it working for others and it's just not working for you? Or are you asking why has it been designed this way?
If it's a design question, the support staff on the forums here have no input in the development of the game and aren't going to be able to answer something like this I'm afraid.