For a soil grow, yeah I think people get sucked into the marketing and think that nutrients are 'fuel' to a plant. So either the more the better, or there is a magical exact precise ratio of nutrients that if provided will double your yield, or double your THC, or 1/2 time to harvest, or whatever. It is marketing hype. Now granted, if you know nothing about soil, spending the extra money on a premixed product specifically for cannabis is probably a good idea. But I can go to the quarry and get a cubic yard of biocomp non-hot compost/soil for $40. That is a lot of quality dirt.