 The game's revenue system, in particular, has faced mixed opinions.Players playing for free "won't be able to advance as much as the person who has the funds" without a considerable time investment, which often sparks controversy between free players and those who paid for in-game bonuses that can cost as much as 2500 credits, the equivalent of $725 per item.The IGDA acknowledges that the system requires "delicate issues of design balance".