well i dont know about others but the testos that i use to take was 4.5g a tsp, not much, but i take it every morning, before workout, and before i sleep. thats a total of what 13.5g? the actuall supp that i take is NOT testos, but it helps produce them alot quicker in the body. this actual supp is a form of amino acid really, which in fact is good for the body.
but then i see where you are coming from, i know most of the suppls doseages arent enough for the body to react to it. so why do people take it? well, from another point of view, if you take it on a daily basis, your body will grow immune to the supp requiring the body to have more intake of it. which is why the idea of taking any supp daily WILL effect the body, and later show result physically.