The economy is a little slow and low on his server, so I'd say underprice.
My leatherowrking is 265. It's really good for me as a Druid and I have a lot of non-AH repeat customers. That is, people who come to me to craft things for them. Since people do the non-producing professions like mining and skinning, and then sell the materials on AH to make gold, they need someone to actually make their stuff eventually. I make money selling rogue/hunter gear and armor kits almost always sell on the AH. The blues rogue gear always sells. On older servers you can get 15g for Shadowskin gloves. Before that you can sell Toughened Leather Gloves and Barbaric Bracers. Also, an Ally quest requires Hillmans cloak, so you can always sell those easily. One of the more pricey leatherworkign items is the Helm of Fire, which I just learned, but the materials are hard to get and expensive to buy. You can then turn around and sell it at a high price. I'm guessing maybe up to 50g.
Early items that sold for me:
armor kits
+agility gear
fletcher gloves
20-30s stuff that sells:
barbaric bracers
barbaric shoulderpads
Hillman's Cloak
Toughened Leather Gloves
Shadowskin Gloves
rogue sets(dark leather)
Green Whelp Armor(recipe is a drop, materials are in Swamp of Sorrrows, but this always sells and is great pvp gear)
I don't make and sell the +agility pants at this level much, because the Triprunner Dungarees from the Ally Gnomer quest are better than pretty much anything for many levels, so demand for rogue and hunter pants is low.
Right now anything i make of the Mail armor variety for hunters sells quickly. So the Scorpid sets work. I've outfitted most of the druids on my server, since I can make the Voodoo items and things like Wolfshead Helm.