Are the RGB sets missing a second 2.25u shift keys?
In the case of the mod sets if someone needs a second 2.25u shift key, she may buy the corresponding pro set that carries one 2.25u shift, plus more different keys that worth to buy the addtional set, but in the case of the RGB, I do not see a reason to buy two sets of the same just for the sake of one key... do you?