I think people are up voting this one based off just the message, rather than the content. The message is important, I guess. Plus a lot of 37signals staffer's

I think people are up voting this one based off just the message, rather than the content. The message is important, I guess. Plus a lot of 37signals staffer's and friends use HN - they will likely be up voting this based off a Facebook post or similar. ~10 of the 21 points being users affiliated with 37signals is very likely.