Poll: For how many 37signals customers can you claim credit?

A recent post on 37signals's SvN blog claims that the business value of being on the front page of HN does virtually nothing for their bottom line (see http://news.ycombinator.com/item?id=3680018 ).

Left unsaid: how many HN visitors to 37signal properties are technology influencers who have referred 37signal products to others? This poll is an effort to guesstimate the answer to this question.

For how many 37signals customers can you claim credit?