Don't think its a bug but noticed some "backwards" progression on crafting materials and tools/weapons. Theoretically the harder something is to craft (skill) the more exp it should give. However, I have noticed that both Mithril and Marble do not behave in this manner. For example:

at 1100 skill in Sculpting:

1 Marble Essence Syphon -@1000 skill = 6 bricks to make and 3 returned upon decon = 1025 exp therefor 341.6 exp per brick used
1 Marble Clay Scoop - @1050 skill = 8 bricks to make and 4 returned upon decon = 1233 exp therefor 305.7 exp per brick used
1 Marble Brew Stirrer - @1100 skill = 10 bricks to make and 5 returned upon decon = 1437 exp therefor 287.4 exp per brick used

The golden rule of crafted had always been to craft what you can just barely gain optimal on but at this rate...people are in fact nerfing themselves in the long run. A full load of bricks constructed and deconned of Syphons will make over 40k more exp. Is there some reason it's like this? Seems contradictory to the general idea of harder = better exp......