Brewing is not an easy skill. It also devours components like crazy. I would actually envisage little problem in selling potions to mobs. Each brewing effort uses a component three times. If its a bulls strength potion, be prepared to have tonnes of manure on you. If its invis potions, then the potion can often work out as fairly expensive.
Scribing also is not an easy skill, largely due to the high cost of scribing a spell.
I do not believe that in any other trade, a person has to pay potentially a lot-lot of money just to scribe one spell. Alright, armourcrafting needs raw materials which can cost a lot, but that is largely a one-off investment. Scribing and brewing takes your money, swallows it, and often leaves you without the scroll and potion you wanted.
That, incidentally, is why the cost of scrolls and potions is often so high. Some fair wizards/priests charge cheaply for those potions/scrolls that don't use components. Few wizards/priests would knowingly take a thirty-platinum hit, which is what some scrolls cost.
PLEASE NOTE: this isn't intended as a moan. I am merely trying to explain that this trade is not the easy, money-spinning trade people think it is. As long as that is taken into account, the discussion can be valuable and correct in its deductions.
~Ol





