Also, another tip that I discovered yesterday:
Sparks of Eminence on mules makes for awesome free Guild Points on Blacksmiths, Woodworkers, and Goldsmiths whenever they want items that can be bought with Sparks.
For example, yesterday's item was a Spark Spear.
Total Cost:
12 Linen Thread
12 Brass Ingot
12 Ash Lumber
12 Copper Ingots
12 Wind Crystals
12 Earth Crystals
OR: 720 Sparks of Eminence (12x Spears for 60 each)
Today, it was Mythril Baselard.
Total Cost:
3 Mythril Ingots
3 Steel Ingots
3 Fire Crystals
OR
594 Sparks of Eminence (198x3).
My Leatherworking mule paid for both (Inventory Expansion, a couple subjob objectives, etc) easily; still has 4000+ sparks left.
EDIT: Yet another crafting tip!
Treasure Caskets in certain areas make for not only ridiculous amounts of gil, but also Guild Points! Batallia Downs, for example, drops lots of Studded Leather Armor. Said Studded Leather Armor is mildly expensive to make due to Iron Chains, but Batallia Downs drops a TON of the crap and they are worth a lot of guild points when they come up. Family member was farming Black Tiger Fangs awhile back to do Tigerfangs and wound up getting 30+ pieces of Studded Leather Armor out of brown caskets. If I don't need them for GP items, I can vendor them for a couple k per piece.
Edited, Oct 31st 2014 8:43pm by Lyrailis