You also forgot buyable hats for real currency. Ban for hl2_wearable_item, also some idle servers and some achievement farming servers, third party bots that will automate gameplay of killing combines, which will have protection so you need to pay to use them and risk of VAC ban, but who cares, you need to kill 9000 combines to get some kind of crowbar +20% damage - 5% running speed.
Also, several endings and announce of HL2: Episode 4: Chapter 1: Level: 1, which "after nineteen years of development hopefully will be worth a wait".
EDIT: Oops, I forgot the lack of dedicated servers. Except for mmo.