Yes, by all means, think of the ODP as a means for editors to recognize sites that have already gotten up and running. eBay is listed, not because it needs help but because it doesn't need help--because even without the ODP it would do just fine.
All aggregate-content sites (including the ODP) are a combination of three things: process, product, and community. The website simply implements the process, which is the most trivial part. But without the other two legs the website is useless.
All the successful aggregate content sites I know about, tackled the product, the "content," up front -- building enough that even without a community, they were significant enough to serve users--and those users were what provided the nucleus of their community. The Project Gutenberg and CCEL webmasters posted the first fifty or so BOOKS -- say, ten thousand pages of typing from their own fingers -- before significant public contribution. The ODP added a few hundred thousand sites before outsiders really started volunteering to help. I understand that Wikipedia came out of the box with a solid core of content from public-domain references. Obviously, most successful classified-ads sites are sponsored by some entity, such as a newspaper, that has a ready source of content. And so on.
I ALWAYS say, if you don't have a plan for competing even without an ODP listing, then save yourself a lot of trouble: take the site down immediately, and go on to something that's not obviously futile. But that's probably not the only option. Any other option entails finding someone who knows what you don't, and who can do what you can't, to provide the full set of skills and necessities for a successful business.