Upvoted - some great tips there. I must say that the use of power words has got a bit silly and it's taken the power out of them. Every day I see posts that have 'Secret', 'Insane', 'Crazy', 'Shocking' and other power words to get your attention, but the overuse of them is actually a detraction. I tend to avoid these posts now as they are usually trying to oversell something that doesn't have the substance that it pertains to have. There are certain power words that are effective however such as discount as you mentioned. Others might be time based such as 'this week only' or scarcity such as 'only 100 left'.
Great post though, very useful.