Every now and then publishers get greedy and find ways to nickel and dime customers with dlc. Below is my top 5 list for the content which should have been in a different price range.
5. Penny Arcade Adventures: On the Rain-Slick Precipice of Darkness
4. Ace Combat 6 Extras
3. Any Guitar Hero Song Pack
2. Majority of Virtual Console Games
1. Oblivion Horse Armor Pack