SS production is okay, but not IS and any Expert weapons production.
Bronze Sword & Horse is all you need (Higher lvl adv also need Bowman to reduce Recruit & Xbowman loss, some need Militia & Soldier to be meatshield because recruits can't do the job)
Most weapons people sold, they get it from adv, and most of time it's 1 time build (Once you've train Soldier/Longbowman/Xbowman) you will cherish it until they needed to sacrifice, not with Xbowman though.
trust me, you'll get more weapons by doing adv than produce it.