It's possible, but it's also important to be aware of the business side of things.

Valve makes a significant amount of money from in-game transactions, and some of their practices around this are shady. Issues like kids using their parents' CCs, gambling industry built around in-game items, and the potentially addictive nature of colorful virtual items marketed towards kids are valid concerns.

So, while gaben might be nice, it's unlikely that this gets in the way of Valve's drive to maximize profits in every way they can legally get away with.

That email address goes to a team of people, but if you send something substantial and well-meaning, they'll look into it.

He does respond to minor inquiries frequently, but do remember that his company supports a gigantic predatory underage gambling market.