Do monsters have XP for item crafting and other activities?

[Schadenfreuda]

A couple of months ago I was thinking about whether Solars and Planetars have any XP for their innate spellcasting, since that abilities do not come from class levels, and thus they do not have any assumed XP total (http://www.giantitp.com/forums/showthread.php?584846-Do-Solars-and-Other-Monsters-With-Innate-Spellcasting-Have-XP).

Several ideas came from that, among them that deities have around 30,000 XP/week for crafting and granting miracles to their followers. Solars, being among the toughest things that aren't deities, probably do as well.

However, are there any actual rules on how much XP NPCs have in any given period of time to craft magic items and such? Crafting according to the SRD never actually mentions whether NPCs must follow the same rules as PCs, and there are other instances in the game's rules where NPCs are treated differently from PCs, such as if memory serves WBL guidelines for NPC adventuring parties.

This is mostly significant because many if not most NPCs who might be interested in crafting magic items may not be necessarily interested in adventuring and taking on level-appropriate encounters to replenish spent XP the way players are, anyone who had to lose XP to craft items is given heavy incentive to seek some other line of work.

[unseenmage]

Any crafting creature could benefit from the use of the Ambrosia item created by the Distilled Joy spell. Both are found in the Book of Exalted Deeds.
Alternatively a Wish might be able to conjure up to 125 doses of Ambrosia in a big jug all at once.

The Transference spell (http://archive.wizards.com/default.asp?x=dnd/we/20060526a) allows one to buy crafting xp from another.

One can use Greater Restoration and creatures that drain levels to obtain unlimited crafting xp (https://www.enworld.org/forum/showthread.php?288611-Infinite-Crafting-XP-(3-5)).

Of course there's always Thought Bottle abuse (https://www.enworld.org/forum/showthread.php?107098-Complete-Arcane-Though-Bottle-abuse-and-Magic-Item-Creation) as well.

To my knowledge all monsters with more than 3 Int are capable of taking class levels. That said they should also be capable of gaining experience. Which means they should be able to benefit from the above craft xp cheesing tricks.

Remember too that experience is.not just gained by adventuring and combat alone but rather from overcoming adequate challenges.

Perhaps oratory is how angelic beings level in the heavens while executing a meticulous scheme is how xp is gained in the a lawful underworld.

[Schadenfreuda]

Indeed so, on all those points. XP is for solving encounters, not just killing monsters. It could also be that XP is generated naturally over time, in the same way that simply living for so many years allows you to learn new things in the real world, essentially allowing for feats and skill points to be earned without actually levelling up. Between that supposition and the Ceremony feat from your link, it does indeed seem that teams of people whose XP regenerates slowly and automatically could form workshops to make magic items.