500 credits a day really is pushing me away b/c i have to buy all my credits which tells me the developers r cheap now personally i would like to see
a trading system
higher rewards
ability to replay campaign on a high difficulty for more credits
no caps on credits earned a day
great game though i just hate it when a game makes u feel like u constantly have to make IAP
over at the unofficial forums we agree with you entirely, the devs have announced that the auction house is coming, probably in April, and the iphone/ipod touch release is also happening soon. We are recieving regular updates for the game and we are having open discussions with the devs in the direction of the game. Its well worth a read:
http://bit.ly/acrecollection