The percentage ratio for lineage 2 armor and weapons drops is quite rare. Perhaps in order to facilitate more interaction between players, the items that monsters drop will not help you at your current level. Namely, Lineage 2 item drops are always lower than your skill level, so you'll really have to depend upon people with a higher level to get a good drop and sell it to you. 

As lineage 2 shops sell their wares for a very high price, selling drops from monsters is a good way to accumulate lineage 2 adena. Only the most desperate of players will buy their items from an NPC, where the majority will hit the player markets to get the same items at a much better price. Indeed, after some solid adventuring you'll often find experienced players attempting to hawk their wares. While you have a limited space for items, you're able to store all the lineage 2 adena you can make :) 

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