Mash is what the grains and nutrient amendments are first milled to. Then, those are mixed with a bit of water, and extruded to make pellets. Then those pellets are crunched up to make crumbles. My mash is really quite fine, enough so that the chickens most likely wouldn't want to eat it dry. I think that traditionally, it was intended to be mixed with water. It's a bit cheaper than pellets, which are also a bit cheaper than crumbles.
The roos go to my freezer. I've sold some pullets, hope to sell some hens in the spring. I've offered some of my girls for sale this fall, though no takers. (could go to craig's list, but birds there don't seem to have a very good market value.) I'd rather hang on to them, and feed them than essentially give them away. May take some to the TSC swap days this spring, but... again, that's a calculated risk, b/c once it leaves my yard, I don't want it coming back.
VM, see my response to your original post. If that doesn't answer all your questions, feel free to ask some more! Fermented feed is really very easy to make, and IMO, it gives the flock a huge nutritional boost, while eliminating all waste, and a bag of feed lasts longer.