Of course, if you keep 20-count exceptional Town Cryer BODs, or 20-count normal leather 6-part larges, the cost of a CBD is the cost of filling the BOD (which you'll get back from the gold, for the most part...)
I've had as many as a dozen CBDs before as a casual tailor. In fact, I get things worth CBDing a lot more slowly than CBDs.
So, I went ahead and used a few CBDs on my own characters' items (my Spirit of the totem, the Kasa of the Ri-jin, 1 pair of sandals, 1 burglar's bandana, 1 Polar Bear Mask, my 2 CCs and the pads of the cu sidhe that my human tamer wears). Granted this was over 6 years, but none of the CBDs cost me more than 20 suits of normal leather armor (700 leather for male suits, 920 leather for female suits).
That's what? 40-70 dead animals (11-16 lesser hiryu, if you can do them), and 12 gold for 4 NPC tailoring kits (or 2 ingots for one good, exceptional quality sewing kit of 120-150 uses)