Quote Originally Posted by soviras View Post
The speed at which you gain xp from fighting in the arena is too low to make more of a difference than the money you get from the bosses. With the old cap, you could make up the difference due to the rather high amount of money that you would need, but with this amount you would lose time on it instead. The time it would take to catch up to the amount of money you missed out on from boss battles means that the cost to be higher so that you actually have time to catch up on the lost millions.
It took weeks to get them to continue the story in the quest. Barring that the only way to get XP aside from daily missions is arena battles. You are looking at missing out on more than 2000 xp a day if you ignore that aspect.