Watch out for other party members or people in the game so that they don't pick the item up. If this is a worry, use the secure trading method. Secured Trading can only be done in town, so dropping an item on the ground for another player saves a trip back to town. Trading is a great way to find those hard to find items you're looking for. Some items cannot be easily found or Gambled on your own.
Many people have the goal of finding the best possible equipment for their character.
While playing a the game a lot can help you do this, trading is often much easier and faster. Realm Trading is very popular. You can simply ask players in your current game if they have anything to trade or if they have items you're looking for. Be warned, however, that many players wish to keep their game playing and trading experiences separate and may not wish to trade while they can be playing the game instead. It doesn't hurt to try, but don't be surprised if people suggest joining the trading channels or a trading game.