I've said before it is possible to view unidentified items, and below is the actual method.
How to view unid stats without identifying
long explanation
Short simple explanation
So why not buy unid items ? Well, if someone can already view if the item is good or bad, then they can sell trash to the unsuspecting noob. So do you want to spend gold on junk ? Of course not. hence don't let yourself be scammed.
hope this helped someone, although i suspect i'm just gonna get trolled to the max for sharing