I'm honestly surprised a token for FFXIV hasn't been added yet.
For as long as WoW has been running, there were all sorts of shady gold selling and level boosting services centered around WoW. They constantly spammed the chats and advertised on forums, over time becoming ingrained in our minds like all successful advertisements. As the game grew and the amount of effort required to obtain something we wanted rose (more expansions = more time spent leveling = more time playing through stuff we don't want to play through just to get to the content we want to play through, or more expensive gold sinks = more time spent farming), players became more and more likely to turn to these services. As such, many had their accounts banned (for possessing stolen or duplicated gold/chargebacks) or their accounts stolen, and the success on the end of gold sellers and level boosters only encouraged them to continue their operations. No matter how hard the GMs tried to shut them up, they would still pop up and the problem only grew. Trying to stamp it out was a losing battle.
Blizzard realized that if they could never get rid of gold selling, than they could at least try to make it as safe possible. Thus, their ingenious solution: the WoW Token. Blizzard legitimatized the gold selling process and made it safe. Players who REALLY, REALLY wanted to skip the tedium could, and due to the design of the process, Blizzard was also able to reward players who took the long and hard path and invested much effort into the game, by allowing them to convert their ingame gold into a token for a service they otherwise couldn't get without paying real money. My friends who played WoW nonstop were able to pay their subscription fee using the gold they earned ingame. They were able to continue playing WoW and buy other Battle.net games for just playing WoW. Blizzard still gets their money; the person who bought the token with real money pays for the subscription of the player who bought the token with gold. The person who wanted the gold is happy. The person who wanted Bnet balance or a free subscription is happy. Everyone wins.
I don't think the P2W accusations holds much water in FFXIV. There is little competition in FFXIV, far less than what there is in WoW at this point.