I have found that if you ID every single item:
1 - The price will be higher
2 - You may find a white text item that does have an upgrade (I salvaged an Axe Haft from a white text Spiked Axe, because after I ID'd it, the name changed.
Normally, I only collect mid/high damage/energy items, or unidentifed mid/high damage/energy items. I have raised the price of items from 10gc to 39gc just by ID'ing a normal white text item. Rule of thumb should be to ID everything before you sell. Even if it only raises the price by 3-4gc, which I have found is only about 15% of the time, you still would get 75% out of gc spent on ID kit. I have doubled my income now by doing this...
