As one of those macbook-carrying conference attendees, I'd like to know what the alternatives are. I look around Linux and Free Software conferences at the sea of thinkpads, and it drives me crazy. I've not found a way to buy a thinkpad without also buying a proprietary operating system from Microsoft. How is that more supportive of Free Software goals?
Personally I don't intend to buy another Apple laptop, for the reasons you cite and many others. But I'd like to see more actual linux laptops and not just laptops, like mine, which sometimes run linux.