A lot of nutes are short on Mg. Shultz for example, thus MrFishy supplements with Mg. There are other micros that marijuana needs that will not necessarily come in the right ratios (or at all) in general purpose fertilizers.
The nutes you listed are not organic, and there is not enough potassium in the bloom fert.
It is not very expensive to buy quarts of good grow and bloom ferts, something like $15 or so. Considering what you get for that in terms of growth and nutrition, it is easily worth it IMO.
Where things get really expensive is when you start buying all the goddamned supplements. For example, while I use grow and bloom, you can get cal/mg +, sweet, liquid karma, clearex, etc ... that will easily triple your nutrient costs per cycle. Let others tell you whether or not those are worth it, but that's where the $$$ come in... I've done fine without those.
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