Hey There
I suggest that Drop box come up with pricing structure which suits users outside USA, for instance it is easy to pay in ZAR than in US$ especially for new or small businesses. annual prices are rather high for a small businesses to pay $517 is almost ZAR 6000 which i believe is too much. Dropbox is a great idea but should new and cheaper technologies come up with the similar ideas then this might pose business challenge to Drop box, therefore, i am of the firm view that you should consider new pricing structure.