Personally, I agree with firekil, because it is awfully exciting identifing you items
On top of that, it saves you money, and if you find something that is good, but you don't need, you can always sell it.
Finding items:
+Excitement
+Makes Money
-Don't always get what you want
-Could take time
Buying items:
+Get specifically what you want
+Faster (most of the time)
-Spendy