As I have followed the production of half life 2, I know this game is going to be sweet! So I'd sign the petition, but it's useless and its wording is flawed. "many mac users have pc's we'd love to get rid of?" Not me, and why would a company want to port a game knowing that "many" of us already have pc's to play it on? The one and only thing that would get them to make that game is how big the mac gaming market is. Apple still needs to do more to promote gaming, make it easier on developers, etc. Though many macs out there are fast, robust, etc, most can't even handle games like HL2. Most of the macs that can are sitting in studios, not homes.
If someone offered you a dollar to mow a lawn, but the guy next door was going to pay you $10 for the same thing, would you do it?