Your choice - but think of the game as having a 'pay-for-convenience' or 'pay-to-avoid-grind' business model. Do you grind for 100 days to earn 10.000.000 AD, or do you spend money to buy Zen to convert to AD to buy it right away? Let's say you want one of the best items in the game.
The catch is that getting the best gear requires either a lot of grinding or spending some actual $$$.
