Quote Originally Posted by Gameguy View Post
Besides Half Life 2 which needs to be registered to a specific Steam account and can't be transfered once activated.

Most of the games are worth around $1-$5 each if that, I can't see any titles that stand out as valuable.
Agree for the most part. Depending on what version some of the games are (big box original release, small box rerelease or DVD case), a few could go for $20or more, but the games you listed are only of any significant value sealed and even then, all of these are super common.