| > It really does amaze me how accurately sales tend to go back right where they were after an event. Are there any recent examples, do you know (or does anyone know), of an event genuinely raising sales over the long term?|
I think the "Death of Captain America" event would be an example of what you are looking for. The series increased somewhat for Civil War, exploded with the "Death of Captain America" and Bucky Cap has maintained some of those sales for a while. Issue 42 (September) sold 22K more than issue 10.
Of course, long term is relative here too.
And continously raising sales is next to impossible in comics, simply because of it's nature. For 99% of titles, no series is going to continously have an increase in sales every month. Comics are by their nature on downward spirals, where each month it sales less and less. Which then creates shake ups of the titles (new characters, new stories, new creators, event), and the process continues again.