On the Artificer debate I'd kick in: They have versatility, they're not confined to a single class spell list. That's pretty amazing, whilst any Cleric can make a scroll of any divine spell, any Archivist can eventually create a library to use as a spellbook and make scrolls from... but an artificer has that versatility without putting in any effort. No matter which side of the line your DM falls on the WBL debate.
In other news: For the Sacrifice option which is amazing, that really doesn't take much optimization does it?
It synergises well if you have Leadership (start a cult? sure) then use your followers to get that +2 for having 100 people attend... actually that's a thought.
In E6 for example, you could use a Sacrifice to get a Wish.
Max Ranks in Knowledge Religion = 9, let's say an int of 14 for +2. Maybe buff with a fox's cunning for +4.
9 ranks + 4(2
+2) Int +
11 Insight +
20 Competance + 10 Circumstance + 2 Aid Another = 56
Circumstance:
Ritual taking 1 hour +1
On an alter +2
Desecrated site +1
More than 10 followers +1
More than 100 followers +1 (Leadership feat)
Sacrifice is tortured for a day before the ritual +1
Sacrifice loses extremities to a hungry demon prior to death +1 (Summon a Dretch, tell it to eat the sacrifice's hands... then use healing spells on the sacrifice. Ties in nicely with the torture part.)
Subject is good aligned +1 (have a follower with detect good locate targets.)
Subject has 1-5 HD +1 (easy to kidnap, you can get better sacrifices though for bigger bonuses)
Total: +10
So a total of +56 without trying hard at all, a few cleric spells for a knowledge religion check. Which means you hit a minimum of DC 57. Which is 7 over what you need for a Wish spell. Only thing "invested" is the Leadership feat... which is an amazing feat anyway. Also if you're not a Cleric, considering the spells are all Cleric 2, your cohort could be a Cleric and cast all the required spells for this... the only requirement for the entire thing is knowledge religion as a class skill... even if you had 8 INT you could make the DC 50 check.
If you can request lower down rewards then why not ask for greater magic weapons, Even with a 1HD commoner, a +5 weapon for a day is a good idea for the evil cult to get to prepare an attack... get a bigger HD creature and buff a whole raid...or at least the core fighters. Combined with 24 hrs of Divine Power for everyone too for a second sacrifice in a different temple (like Soro suggested, extradimensional space.) Or maybe you can add together a 15 check reward and a 40 check reward?
As for crafting You can hit a DC 60 check easily. That's 180xp or 300gp off an item. Not fantastic, but when you can do it every day... lots of free items, maybe even trap the sacrifice's soul for an extra 10xp.
You could theoretically hit DC 76 and get 228xp and 380gp, but that's risky unless you have a way to auto roll a 20. Maybe use a Limited Wish spell for an item that allows you to take 20 on sacrifice checks
I think I'll be using Sacrifices in my E6 Campaign, there's an evil Hextor cult trying to start a war and they need all the help they can get. Ritual Sacrifice to Hextor will probably be a gladiatorial pit.