Yes, bottled nutes and beneficials are convenient, but if you made a good aerated comopst tea you'd have millions of bacteria and other beneficial microbes as well as active fungi and active protozoa (can't get that in bottles) with thousands of different species, and it would already be a functioning consortium for nutrient cycling (like in nature).
If you need myco, look into the endo product by mycorrhizal applications or the one by bioag.com. Save you tons of money and it's a better product. (these hydro-oriented companies overprice their products because they know they're selling to mj growers).
As for "bio-activators," pick up some unsulfured molasses (I can get it at a feed store, QFC, or whole foods locally). Organic alfalfa meal will work as well or baby oatmeal from the grocery store (promotes bacterial feeding nematodes). Kelp or seaweed is another excellent product for increasing biological activity. Otherwise, you're just paying extra for a brand name.
Just my 2 cents though. If you have the money and like the products and your plants are happy, then I guess just stick with what you're doing.
Cheers,
CT