I read that as well, but at the same time when you buy a base mix it is normally at optimum levels of ingredients for the compromise of cost, nutrition and rolling.
Cutting it with maize meal, semolina or soya flour to make it go further is just doing what various bait companies have done and gone down for.
I can give you a very basic base mix, that will work extremely well:
10% Liver Powder
20% Calcium Caseinate
30% Maize Flour
40% Semolina
Flavour wise, the Liquid Liver from Rod Hutchinson. I did used to use Nutrabaits Liver Elite.
You could modernise it with a hydrolysate in the eggs.
Now that was sold as a proprietary base mix or completed bait.