PVP game mode needs rewards to make it alive once again.

[Bonbori]

Nuh not really. You can throw all the rewards in the world at people and it might even make them queue more... but if you actually want to do PvP for fun/challenge/any meaningful reason, do you REALLY want half your party to be in it just for the loot, full stop, and not care at all about the competition? Artificially inflating participation only results in a mass of players who at best run around like a bunch of headless chickens because they have no idea what to do (they're there just for the tokens and maybe to accidentally get carried to victory if the other team happens to have relatively more people who don't care) and at worst actively feed the enemy to make the match as short as physically possible.

Rewards don't make PvP better. And they sure as anything don't make players want to be better at it. Until they make the experience of playing PvP feel intrinsically rewarding, no amount of extrinsic rewards will make it worth most players' time.

But even if they did make it amazing, PvP is still not everyone's kupo nut. There are people who, no matter what, will never ever enjoy it, end of story, and luring them in with rewards that are hard to ignore would only make them miserable. I even suspect that the majority of people who are interested in PvP in FF14 are already playing it so the population has little potential for substantial growth.