Getting open and Stamina have proven to be extremely useful in Baltimore to help with avoiding the heavy density of politicians around the Baltimore area. Honestly they are just the worst, always hounding everyone for every last penny to their name, and now that Karl has established himself as an every day player, with 6 zeroes in the bank account those politicians want a chunk of that. Constantly calling his private number, sending personalized emails about how his contribution will help make the country amazing.
This is where stamina has been coming in helpful. It's exhausting dodging these money hungry vultures. Give them a penny, they ask for a dime. No matter who is in power it's always the same story with nothing changing, so Karl has found it important to be able to get away from these fiends, and when he isn't able to find an open area free of politicians, than he requires the stamina to endure their constant pandering, excuses and double speak.