Advice for starting an online community with an ambitious goal

On one hand it is such a niche topic, but on the other it is something that everyone has to deal with, I'm curious from that aspect.

I would seed the community:

• with content and ensure they get responses, even if it is from just a handful of people, or you responding as someone else to answer the questions.
• with all types of questions that people have around passwords.
• find people who are asking questions or talking about passwords write up a discussion on it, then point people to it.

Is it a good idea? I dunno :D Will you enjoy it? Learn from it? Make money from it? If you don't make money will it bring value in other ways? (e.g. build up a community and reputation which you can use to your advantage?)