I never said anything was devastating. But you just said yourself that some pranks were 'asking sports stars to autograph 100s of items, roadblocks keeping people from getting to their photoshoot or appearance on leno, people being fired from restaurants (and blame being placed on the celebrity), etc.' which is sometimes immature and gets old quickly.
Also-many of the worst pranks that DO offend stars never get aired because the victum doesn't give permission.