Spellcrafting is the only reliable craft where you can make money b/c you can't stock merchants with the items. People get a template, and they are willing to pay for the SC'ing to have it done now. All the other crafts, items stockpile on merchants, and you inevitably have people undercutting prices.
You still can make money in alchemy, but you need to have a house where you do nothing but store potions on it, and have to refill it regularly. It is a lot of work for a little money per potion. Tailor and armorcrafting can make money as well, especially AC'ing, but it is not fast. Items might sit for weeks before someone buys them.
Having a lower number house does help too. People don't go to page 145 to buy alchemy potions.