When LoL servers are crowded, you have to wait on a queue, which recently has been short (Less than 1 min wait on EST peak times) however, the queue wait times can be as long as 10+mins.
LoL does not manage monthly fees whatsoever, but I am sure they know clearly how much RP has been spent by each player.
Would the RP buyers be put on a prioritized queue? or just ahead non RP buyers when there are long queues?