I feel that any list worded in the style:

- some item - another item - ... - oh yeah, and REALLY IMPORTANT POINT

contains condescension inherently. It says "the last point is the core of my post and is so important that you must know it. See how I faked almost-forgetting-it to clearly show how trivial it is to me. Be thankful that I deigned to hand it down to you instead of just throwing it away."