"You owe me $20" "Ok, hold on, let me get into my car, drive down the street, look for parking, get out of my car, wait in line, pay an extra $1-4, drive back down the street, look for parking, exit car, then hand you your $20 that just cost me about $30 in time, effort and gas."

But maybe I'm cynical because I'm in Austin and driving anywhere is just miserable.