This is what I don't understand either, every mmo is pay to win, it just depends on who you're paying. There is always and will always be RMT inside mmos and the top people are the ones paying them.
People buying candies are only buying a shortcut to their vendor cap each day and then selling the rest off to other players. Roughly 20% of what they buy goes into other players pockets. It's honestly a much healthier method over buying from shady websites or legions who use bots to funnel resources.