I don't know the specifics of your product (or anything about it at all really), but it may be possible if you primed your database with data you've gathered yo

I don't know the specifics of your product (or anything about it at all really), but it may be possible if you primed your database with data you've gathered yourself. Depending on the content, you may be able to spend 20 hours, 40 hours, or hundreds to thousands of hours to develop a base layer of data that will be enough to attract a userbase to "do the rest." Chances are, for most people, this will not work for you, but it is an option, and has worked for others in the past. It's risky though, because if you spend hundreds of hours priming the data and then no one comes, you've wasted a lot of man hours. For some products, there is no other way.