I got off the phone about my "bamboozled" problem/questions:
Although yes, the booking statement breaks out the $20/per-person, per-day charge for the beverage package, the way it actually works is not so simple. In order to drop the beverage package, we have to re-fare the cabin, so in effect it is all one big, comprehensive charge for one single bundle. We already knew that to be the case for the Haven (when beverages are a perk), but it turns out to be the case for this MA cabin as well (one category below Haven).
It's all marketing, sure, trying to get all they dollars from you they can get, but this one doesn't cross the line by any means (unless they indeed are selling alcohol which they know to be out of stock). They're allowed to offer bundle deals.