3. In light of #2, new administators should not expect to make money from their site.
I realize that people at least want to break even. You've invested in all those things I mentioned at the beginning of this message, but there's no guarantee that you'll see any return of monetary investment. But even in the face of this possibility, the administrator's passion should not waiver. Any site on the internet reflects its creator's passion. Time, patience, and original quality content will build your community (see #1). Never, ever, count on other people to help you offset your costs. It's your site, your passion, and your content. Accept responsibility for creating a site: you will either nuture your site, or you will abandon it.
4. And finally, you are never truly alone until you delete your site.
Millions of people use the internet. Out of those millions, there has to be several people who are interested in the same things you are. You're never "out of the game" until you hit the delete key. Just focus on building your content yourself -- because your site represents your interests to the world. Like I said earlier, if people find your site and join it, then a community can start. But if you, as the administrator, are half-hearted about your own site, you cannot expect other people to be whole-hearted about it.