Could be a freemium model: free for n pages per domain, $5/mo for unlimited. Also, a free version could have a logo/link to the site, while the paid version is

Could be a freemium model: free for n pages per domain, $5/mo for unlimited. Also, a free version could have a logo/link to the site, while the paid version is completely white label. Finally, it might just be a good project to have on one's resumé. Even if it's not directly profitable, it could lead to a better paying job or a better chance at get some VC funded.