The reason I don't make large volumes of base is that I don't see it as either necessary or desirable.
I don't see it as necessary because my experience is that pro-rata scale-downs work perfectly well. I know that some others disagree.
I don't see it as desirable because if you're not too keen on the recipe you try, or you make a mistake, then there's potentially an awful lot of base to use up or throw away. It could, effectively, block you from trying any further recipes for several weeks or months, until you use up all the existing sauce. If you use the base even quicker, it could be unhealthy.
It is however necessary, in my opinion, to start with original large scale BIR kitchen recipes and work from there. I'd sooner scale the recipe down myself than have the chef do it and publish his 'home version' in a book or anywhere else.
Regards
George