From the demo, it looks like you provide a subdomain per user. If that's correct, maybe you could allow paid users to assign a different subdomain to each proj

From the demo, it looks like you provide a subdomain per user. If that's correct, maybe you could allow paid users to assign a different subdomain to each project? Have you talked to any of the users doing this sort of thing? Asking why they're doing something will probably point you in the direction of the feature far better than a comment thread on HN.