Presumably, someone at TED brought up this very point, and the solution was to put the lectures online. Doing that put inspiring lectures in front of more people than possible by expanding the conference.

You might talk about the perk of being at Google is eating free food by great chefs, even though the actual reason you work there is because you want to work on great things with great people. In the same way, of course you're are going to twitter about bono and al gore being there, even though the real reason you're there is to see what people on the forefront of technology, entertainment, and design are doing, and do something about it in whatever way you can.

It's not that people don't want to talk about why they're actually there, but it's far easier to talk to someone else about perks rather than core reason. That sends the wrong message to those like the writer that feels outcast.