http://store.steampowered.com/public...m_client_linux which clearly has specific Deny rules setup as it still shows a 403. What are Valve hiding there? Obviously it's just part of the gigantic troll on Michael Larabel and the linux community.
BTW I give up now, anything further you post - I agree with. There's no point arguing further and I'm just perpetuating the thing I hated most when I was lurking on these forums - which is the derailment of threads here. Apologies to everyone for the giant post, I will stop now.