Customization Options

Since the game is not going to have any pay to win option I totally suggest you guys look on character, weapon and compound customizations. All good free to play games have this as a revenue option. Eventually for the beginning you can make all the guns from the same class look the same (including uniques) and sell what you already have designed as customizations.

Also clothing (since it has no stats) can have like a lot more less drop and actually be sell.