Good day!
Mercantile skill makes it so you will, at a few select merchants, get access to their "special selection", or, as it seems to be, the Good Stuff!
The question is: How good is this stuff?
-Is this unique equipment you can not buy anywhere else, or rather more of the same?
-Can you buy stuff of such high quality that it can justify skipping crafting?
-Do you on the top tier selection get to buy something really really awesome?
It would be cool if there was something sweet to justify Mercantile, and not just a trap for skill points.