You need to take error into account, too. Can atmospheric conditions corrupt the transmission (this is not a rhetorical question, I actually don't know)? If so then your latency and bandwidth will both suffer.

EDIT: also, in the very likely case that the packet is not addressed to the satellite itself, routing comes into play. In the best-case scenario where the satellite is somehow able to transmit the packet directly to its destination the distance it travels is actually doubled. If the packet instead gets transmitted from the satellite to a base-station which then routes it through fiber-optics then there's no point in trying to argue that the satellite connection is the faster of the two even if that is true.