No changes are planned for the cost of rewards based on the drop rates and the ability to spend previous Treasures of Halloween points. The mini and boss mobs give the most points, and the plethora of creatures give ample opportunities to roll for an artifact in addition to the points they award themselves. Don't forget luck also plays an influential roll in drop chance.@Kyronix
Could the artifact price for the reward titles be lowered? Their 20/30/50 price is ridiculously steep compared to the Kotl event's 10 artifact price.
Also, killing the mini bosses should be a guaranteed drop of at least 1 artifact per person.