ScoutGuy
First Step
Let's be honest, the one thing you buy ranks for (other than boss due to its 2x sell rate) are the commands. Don't get me wrong, player vaults and more /ah slots are nice, but for me the main reason you'd want to buy ranks is the commands. I think that there should be a way to buy said commands without having to pay $60 for a rank, especially if you don't want all the other junk included with it. It wouldn't be hard to add either, just another section to the shop where you buy commands for unlimited use. For example, if you wanted /fly you'd just go to the shop and pay maybe, $25 for it? The prices are up for determination but regardless, I think this is a good way not only to make money, but give players who don't want to deal out 50 bucks for a simple command.
TL;DR : Make commands available to buy from the store to increase profit (maybe)
TL;DR : Make commands available to buy from the store to increase profit (maybe)