Please remove item #4 under the "For Profit" category, the item referring to kill stealing on bosses. It is not competition; it is griefing and is punishable by the CSRs as detailed in this post (specifically paragraphs 3 and 4).
That post also answers your question on how to react when someone else finds a boss first.
That post also answers your question on how to react when someone else finds a boss first.