Of course that is an option. But I did not start this thread to debate why you should or should not make such a food mixture, I was just looking for other possibilities that others had used in preparing their own foods. If there was an easy way to purchase smaller amounts of raw materials to make my own coral foods or vitamins, etc, that was cost effective, then I would likely do that. However is seems a whole lot easier to just buy the foods that are prepared specifically for the industry and incorporate those rather than re-inventing the wheel.
I have been looking at buying frozen fish foods from online distributors as well. If it makes any difference, yes roughly 2/3 of the ingredients are prepared, but they account for only 1/3 of the overall weight, since the bulk of the ingredients are seafood.
The point in making this food is so that you have a whole-tank food, you can feed your fish, corals, inverts, CUC, everything with one food, instead of feeding this here and that there.
And, it is a DIY food in the respect that you could buy Rod's food, or Roggers food, which has essentially all the same ingredients, but just costs 4x as much. But we're splitting hairs here. To me, getting 12 people together for 2-3 hours and making a 5 gallon bucket of food to save 75% on cost is DIY.