Because it's money and I use it everywhere I possibly can. It's the exact same as using cash. You can use cash to pay for your drugs or you can use cash to pay for your ID renewal from the Department of Motor Vehicles.
Makes sense, but since I need to earn the govt's fake trash money and they've forced me to have a govt spy device if I want to keep this line of work, I use their fake money to pay for the demon device.