Very relevant video to the topic; I've found it amazing! I'm aware of the fact that it probably was discussed here before, but I'll link to it for people who haven't seen it: Authors@Google: Kelly McGonigal.
I think this is problematic for two reasons:
1. It upvotes a lot of comments that are not related to taking the survey.
2. It renders invisible the mass of people - instead of seeing a swath of diverse remarks, ranging from announcements of delurking to discourses on the content of the survey to simple "Took it"s, you see ... nothing, it looks like.
I believe both of these factors are counter to the intent of the upvote-survey-takers norm.
I'll definitely come. Looking forward to meeting other LW people!