Increase the power to make more money and decrease the power if necessary. The higher the velocity the more income you make and the more durability of the accelerator goes down, though keeping the velocity at 0 let's the durability go back up, though it's gonna take a chunk out of your paycheck. Don't let the accelerators durability reach 0, or it will go KABLOOEY!
So far money does nothing, but in the future you will be able to buy upgrades and stuff