Originally Posted by
Roth_Trailfinder
The purchase of something, using RL currency, to obtain some form of advantage over someone who is not making such a purchase. That something could be an in game currency of some sort, or something else for use in game.
Retainers are "Rent to Win" because they confer an advantage over someone who does not have them. This jump potion is Pay to Win because it confers an advantage over someone else starting and not buying it.
I'm sure you have specific examples of more egregious Pay to Win in mind, but those examples do not diminish the Pay to Win nature of the jump potion revealed in the first post here.