Firstly. I don't know either way, but I'd be surprized if Valve were being paid by any publisher. Valve would be taking their cut directly out of what you pay buying it through Steam.
As for you, moo. If I'd been wronged by Valve/Steam as you say, I'd be following Enahs train of thought. Of course, that would be costing me attorney fees and everytime I ask mine a question, it's a painful and costly experience.
Now, I'm not trying to make fun of you or your situation in any way here moo. I would seriously just bite the bullet and send another email to Valve support in reply to theirs banning your account and make a serious attempt at an honest apology. It make get your account back, it may get you nothing. I'm pretty sure all your posts about your problems with Steam may be getting something off your chest, but it's not getting your account back. So, spend your time more poductively and write them instead. Feel free to continue bashing Steam regardless, if you wish. But why just give up on your account. At worst you swallow a bit of pride and write an email. You've already lost, so really have nothing to lose;P
And while I tend to use the word fuck with abandon, I don't use it around people I don't really know. Some people are offended by it, some are not. Simpler to avoid the risk.