Do you reveal all unidentified items?

Do you tend to take a magnifying glass to all unrevealed potential items? I've been NPC-ing most of mine, but now I wonder if that's a good idea. An item with decent rare potential won't sell for more than 5 mil, from what I see (I'm in Khaini). Of course, the exception is if it's a rare drop to begin with. Or, do you think it is better to sell the unrevealed potential item for a couple mil? I'm just looking for some good advice on whether or not I should be wasting magnifying glasses on every unrevealed drop I get. If anyone can give me some justification on why I should or should not reveal everything, it would be much appreciated.

Also, on a side note, is it possible to get unique on reveal?