If you want to play missions alone, and still not spending Verdium?
Wait for a brocall, answer it. Then, when the game starts, exit the Hawk Freedom Squadron app, or just turn off the phone. Wait a few moments, and then turn on the phone or reenter the game.
You will now be alone in the game, earn bropoints, but not spend any Verdium.
Not very nice, but if you are anti-social, perhaps this is a good thing?