Valve should admit fault and pay the fine. Although they finally have a refund system in place on Steam these days, previously their system could be considered borderline fraudulent.<p>In the past, I bought ~3 3-D games that claimed Mac support, but turned out to be completely non-functional on the platform because I had an Intel GPU. Upon pointing it out to Valve and the developers, they would deny fault, and reply that I should have read the system requirements more carefully. That may be true, but given that the majority of all Macs sold today come with Intel chipsets, there should have been a marquee warning in a 50 point font indicating that Mac is "kind of" supported, but not really.