Here is the thing, though, and I am sorry to burst your bubble but virtually every legitimate hobby\product genre or what have you has it's non-science techniques and products...
even in commercial horticulture! (and elsewhere, some gas stations have signs up warning people not to talk on their cell phones while pumping).
Anybody who wants to get into
anything for virtually
any reason is susceptible to being preyed upon.
Unfortunately what it seems to boil down to is that you are biased and bigoted; and perhaps feel some kind of elitism or fanaticism when it comes to your methods, sourcing all of your own ingredients and not paying a dime for them or whatever- and that is great, really. But, you assume entirely too much about how
other people grow here and even
why they do as they do, apparently. You assume that everybody actually
could source all of their ingredients locally, 'naturally', for free... and that it would be
convenient and
efficient to do so. No matter- if they aren't doing it
your way they aren't doing it the 'right' way? (which is ridiculous). Furthermore, this is the freaking internet (let me know if I need to elaborate on that point).
Pretty labels were never the determining factor in which plant\soil products to try (liquid or otherwise). It was the ingredients, any other pertinent composition info and the price, mostly. Undoubtedly spent more money on equipment: HID lighting systems, bulbs, back-up bulbs, ventilation, carbon filters, electricity, a generator, even high quality genetics, etc. than on bagged soil, liquid organic and dry amendments.
For example, we also use Espoma Tone products indoors, on cannabis
and other plants. Espoma products are great, entirely natural and predominately industry by-products: not expensive. The liquid plant\soil foods I use are really not too expensive either and
are not just for cannabis. We're growing other things indoors basically the same way (Citrus mostly at the moment).
Haven't you ever seen a non-Cannabis-centric gardening magazine like
Urban Gardener, or been on another gardening\horticultural web forum like say
GardenWeb?