I think others here have made a fair case to support their stance on whether or not to do these. Personally, I only do enchanter writs. For alchemy materials, the Shadowy Supplier can give some reasonably valuable stuff if you select the "poisons & poisons" option. Of course, there is nothing preventing you from doing both alchemy writs and the Shadowy Supplier, so have at it!
Wolfhammer wrote: »Whats the Shadowy Supplier? Haven't heard of it...