The really key underlying point here is that to make a web service that expands its audience beyond people would be likely to read Hacker News, one must consider the needs of other groups, especially those who will find the service useful without many changes, and reach out to those people. That it's the fandom community in this case is largely pertinent to Pinboard (and anyone else working on services which might benefit that community), but the wider point has relevance for everyone interested in more paying customers than just web nerds.
I agree 100%, but maciej has also found something rare and rather special. A technically savvy group that has a non-technical use case and the ability to clearly articulate their need. Further, their needs are widely applicable to other groups. This does not happen very often.
