Stayed subscribed with a recurring billing option. The longer you stay subscribe the more loyalty points you will earn in a month. They call it "velocity". I recall 120 loyalty points per month being the max velocity... so in 4 months a person like me that hasn't let my sub lapse can do the bag of platinum if I want.
Bag of platinum yielded me around 15k when I last claimed one.
That's about 3 long afternoons killing bears/wolves/snakes in goru'kar mesa as a level 60+ btw. You can do the camp in the 40s (depending on class/merc) it will just take more time per kill... but it will yield xp too.
Less time as a 70+ in Blackfeather if you loot all the $ drops. It scales up from there of course. (just pointing out that there are reasonably fast $ acquisition methods in the game at a lower level now).
Velocity goes up once a month but loyalty points are given out weekly. So with max velocity you would bet 120 points a week not month.
i use it to buy doubloons and pay my housing upkeep. Not really worth blowing that much on 15k pp.