Oh. My. God.
Both of those are extremely useful:
Battle Packs - Buy a set of 4-5 minifigs for cheap, as opposed to paying tons extra for a set that may have less minifigs than that! Awesome-ness!
Ultimate Chess Set - Probably spend some inordinate amount of money to buy a set with 32 minifigs (2 separate armies of 16 minifigs each) and four small castle terrain pieces, and a bunch of extras, like a full size Lego chess board. Less-awesome-than-the-battle-packs-but-still-pretty-awesome-ness!
Although, now that I think about it, the battle packs would be so much better if they included a horse for each side. I only need two more skeletal horses and my 500 Cp themed army will be complete! But no, I have to go buy another set.... sheesh.