Regarding tokens for personal information, my thinking was more that some people care more about maintaining their privacy online (or are shy about sharing pictures*, in this case) and if obtaining tokens is supposed to be equal-opportunity venture... well it just struck me as kind of unfair for those people. Either way, I don't see it as that big of a deal.

*Ticia: Sorry, but I disagree with you. For some people, a picture really is quite personal.

--
And I realized as I was typing the above that I shot myself in the foot earlier because after saying "don't provide tokens for personal info" I immediately suggested tokens for the demographics survey! Although there, one's anonymity is protected.