Here's the deal - all Bandon cares about (and any resort, frankly) is getting their rooms booked up and their tee times filled. That is it. Group bookings are an efficient way to do that and they can get signed contracts, larger deposits, etc.
They don't care about you as an individual. That's not a knock on them, it's just business. Golf demand is at an all time high right now and they have at least 10x demand versus capacity.