I think there should be a limit on how much unobtainium you can buy within a certain time period. My concern is that I don't want it to be a pay to win game. I myself probably will buy unobtainium, but I would be more likely to if there was a limit. I really like the subscriptions, and I think if there were those, and maybe a monthly limit on how much you can buy instantly, that would keep it from being a pay to win game.