Actually they do!
ALL ingredients are brought in (inlcuding the chef. Grain and Salt usually donate the pepper and Sea Salt for every table. Much of the other food has been donated. It's usually raw dairy, grassfed meats and local grown produce. The meals are incrediable.
The conference price is so high because Sally Fallon has to find a hotel that will allow all our own food to be cooked and served. The hotel still charges a plating fee as if we were using thier food. In the past the conference has been a break even event or lost money even with donated food.