With the way dwarves love their brews, you probably don't need outside trade, which the GM has implied is light at best. Still, supply and demand probably means that a 1 gallon keg of any potion would be so far out of the range of the average citizen that it would be hard pressed to sell to the king on a generous day... I mean, if a simple Cure Light Wound is 50 gp per vial... and a vial is about 2 ounces, that means 64 vials per gallon... lets be generous and say 4 ounces (Half a pint) per dose... 32X 50 is nearly 21,000 gold pieces for a keg. And, that's probably one of the cheaper ones to produce.
On the other hand, really, really good ale will go by the 50 gallon barrel like it was water and probably make a healthy profit as well. :)
How long, regularly does it take to get from 1st level to 6th, if you aren't constantly adventuring? I would think that the weapons and armor are more a commission job, and if it takes a few weeks to get a piece, that's a fair job. As you said that you can't really do much more than straight pluses, I didn't bother to ask for anything more complicated than that. I admit that I would of loved an speed or keen enchantment, but I didn't think those were really an option for a cleric. *shrugs*
Anyway, it's all in fun. I have to poke at fellow players and Muse knows this all too well.