just a couple of questions please..

[Naria]

Marks probably are the quickest way to farm myth, but if you want something guaranteed I'd do the Duty Roulette, in particular the Main Scenario roulette. The MS roulette itself gives you 110 myth per day, plus some of the instances themselves can also give myth. If you help a new player complete the instance for the first time, that is also an additional 100 myth.

As for PvP, the fact that this is a Final Fantasy MMO is probably effecting it. PvP was never popular in XI. I've played PvP in other games, but I've never tried it here (nor in XI for that matter). From what I can tell, Frontlines is popular for PvP in a Final Fantasy MMO. At least the Devs seem happy with the amount of people playing it.