I don't think this idea can scale to the point where you have enough paying users to make it worth the time you put into it. This is completely my opinion, and

I don't think this idea can scale to the point where you have enough paying users to make it worth the time you put into it. This is completely my opinion, and is quite subject to debate: this idea also doesn't work because the problem isn't real. There's way more than one way to get a startup off the ground, and if you have a solid foundation that provides viral growth, your launch day shouldn't make or break your product. (Of course, if you're on a tight dealine and need to make user numbers, then that's a different story). To test the viability of this idea, and the size of the market, I would look at how many Show HN posts appear in a single day. I'm figuring that the type of people posting to Show HN would be in some segment of your target market. You could also expand this "survey of how people launch sites" to other things, like AngelList (although I don't think they mention when a company is launching) or Reddit. These folks doing Show HN and stuff are probably your most likely customers, methinks. Secondly, in your survey of the market, take a look at LaunchRawk Ads. See if you can get in touch with the people at LaunchRock and get an idea of the size of their ad inventory... i.e. how many people are putting up ads on a LaunchRock signup page to advertise another startup. What would be a nice pivot for this idea, in my opinion, is user-management-as-a-service. The platform idea would be reversed; instead of startups entering information, users would sign up then get login and beta access to all these cool startups who are using the user-management-as-a-service. Then you solve both the problem of getting startups users and the problem of publicizing the launch.