This made me laugh.
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Because you swore an oath of allegiance to said Comapny.
What good is your word if you change it on a whim? How can any Grand Company trust your allegiance to their organization and their cause if you are so easily swayed simply based on the Rewards you are given?
If I were the Commander of any of the Companies, I would not allow you to join my ranks because you show no sense of honor and your oath means nothing.
How's that for an answer? ;>P (I am not attacking you Ren. Just using "you" in a general sense.)
Immortal Flames 'til I die! (and maybe even after that. hehe)
If not the ability to change companies, maybe allow players to buy items from the other GCs for a higher price once we get additional ranks.