At one time the scout camp lands were just that, land. Scouts would go and camp in the woods and paddle the lakes just like if they were on national or state forest lands. There was little to no infrastructure to maintain. With the creation of dining halls, trading posts, cabins, etc... the cost for maintainance skyrocketed.
Ironically to help pay for these costs, many councils sold public easements to states so that during non-camp times the general public could use the lands for hunting, fishing and camping outside the "main camp", ie the woods and forests. So the general public now use