guess you could say that about any game, however games like CC -Chain Chronicle- (named one I play for reference) does the same but still hand out stuff when the severs are down to make up for lost time
think of it this way, its riots job to keep the game going, now what happened to the hundred of thousands that can only play for a short time today and cant because the sever is down, riot is letting them down, would it be so bad as to give a small ip boost to make it u to them next they can play? not like they will lose money and it wouldn't be hard.
and on top of all this, I do believe it is their job to keep the player base happy as we pay them billions of bucks