Her (wise) response was:
I do offer a limited number of commuter spots... [but] It's such an all-day kind of affair that I hate for people to miss out on anything, and on opportunities to socialize with Don, staff, and other students... I think people, even locals, should come and let themselves "retreat" a bit and get away from family and pets and bills, etc.
Good advice for sure. But, locals, she's offering $400 off the workshop if you'd rather commute.
My experience with these kinds of intensive retreats is that the socializing and networking does, indeed, extend way beyond the normal workshop hours. And while I have no doubt you'll come away from the workshop with loads of new insight into your writing, sometimes it's those personal connections you make during those off-hours that matter most. Those extra hours are why I now count Roommate and Lorin as two of my dearest friends.