How is it a waste of resources if you're crafting to fill BODs for turn-in? You actually get SOMETHING in return for the effort when turning in BODs, be it a usable reward (RSKs, CBD, etc.), or at least, another BOD with the potential to contribute to a good reward. Unlike tailoring gains, you don't have to craft something at the edge of skill to gain - ANY item with resists gives you the chance of a gain when crafting, be it a barbed bone tunic or a bandana. and, if you're NOT legendary yet, you can even get the gains making the things you normally do to gain tailoring skill (resulting in a waste you were ALREADY going to be doing, anyway).
By definition, your way is a 100% waste of time, because you get ZERO other than the skill gains.
BTW, I tried your method last year when I trained the skill - gains were so few and far between I went back to filling BODs for the gains, and gained 5.0 in the time I got 0.5 loring a weapon. Maybe I am bugged, if it took that long, but I doubt it.