It seems like everyone in the community does a lot of manual labor, and it's really hard to get a ton of calories from a vegan diet especially when you need to feed 73 people.
Dairy and meat are calorie and nutrient dense. There are some fruits/vegetables/nuts that are as well of course, but it sounds like they mostly sell their nut butters.
The best nut butter is when they switch production from almond butter to cashew butter, there's like 50lbs of nut butter that comes out that is (::gasp!::) mixed in unknown amounts, so it can't be sold with accurate packaging. Hot tip, almond/cashew butter is amazingly delicious regardless of what proportions you mix it in.
Dairy and meat are calorie and nutrient dense. There are some fruits/vegetables/nuts that are as well of course, but it sounds like they mostly sell their nut butters.