I never ran a winter guard but I have done a winter drumline. This was some of our costs.
$2,000 for school rental in Dayton
$16,000 for plane tickets to Dayton
$6,000 for a bus in Dayton
$10,000 for hotel rooms in Dayton
$8,000 for truck rental and fuel to get equipment to Dayton
$5,000 for food in Dayton
One five day trip to Ohio would cost us almost $50,000. Other cost that I wont go into that much detail about would be school rentals for just about every weekend during the season, insurance, music, STAFF, equipment, transportation, unifoms, and props. Our budget was over $100,000 so I could see a guard spending $80,000.