You can get crappy Event decks at almost half price soon after release, though. I remember the UR Flashback Event deck was at like 13 bucks a week after release on some sites (I remember looking into it because I bought the Sturmgeist Intro pack and wanted to expand on it)
But lately, at least ONE event deck flops, or is bizarre. The M13 Red event deck had ONE M13 card: the phoenix. Everything else was from the Innistrad block.