The Auction House
While making gold with Leatherworking alone is profitable, you can make a lot more gold if you can gather the materials needed yourself, using Skinning. If you don’t want to spend a lot of time farming though, you can just check the prices on your server. Buy the materials whenever they are cheap and then sell the outcome at a profit.
Cured Rugged Hide
A very reliable way to make consistent gold with Leatherworking is crafting Rugged Hides into Cured Rugged Hides. To do this, you will need Refined Deeprock Salt. You can either buy it, if it’s cheap enough, or create it using a Salt Shaker and some regular Deeprock Salt. The Salt Shaker can be crafted by Engineers and has a cooldown of 3 days, so it’s a must have for any Leatherworker. Even if you don’t want to cure any hides, this is basically some free gold every 3 days.
The Devilsaur Set
This Set is very good prior to raid gear for rogues and hunters, making it a very high demand set. You will need Devilsaur Leather along with some Rugged Leather to create these items, so it would be ideal if you can farm that yourself. But even if you don’t have skinning, it can be profitable. You can only craft the Devilsaur Leggings, which you will need the Pattern for, so they are a bit more expensive. This pattern drops from the oozes in Un’Goro Crater at a 1% drop chance, so just kill them too while you are farming the Leather, if you don’t have it already. You can also sell the pattern, if you like. Be aware that to craft these items, you need Tribal Leatherworking.
Onyxia Scale Cloak & Resistance Gear
While these items are mostly crafted within guilds, there are always some guilds who don’t manage their materials very well. If you can get a hold of Onyxia Scales and/or other crafting materials from raids, you can use them to make useful items. For example, Fire Resistance Gear for the Molten Core or the Onyxia Scale Cloak for BWL. As soon as BWL hits, everyone needs this item to survive some boss attacks. When AQ hits, you can also craft Nature Resistance Gear. This is a very good way to make gold with Leatehrworking, too. You can even save up materials for this before the patch and then get the patterns quickly.