Bundle Gravity Model

Bundle Gravity Model holds that the email platform fee is never the product; it is the anchor weight that pulls a larger service bundle into the retainer. A $6.90/month agency plan on Mailmunch or a single-price multi-brand dashboard on BigMailer cannot support a retainer on its own, so the tool's job is to make list growth, segmentation, creative, and sends inseparable in the client's mind. Once a client buys the bundle, the platform fee becomes a rounding error and pricing conversations shift to outcomes. The model matters because agencies that quote sends alone compete on per-email cost and lose; agencies that quote the bundle defend margin. Emma's multi-tenant architecture, supporting 10+ subaccounts and 25+ users, is the clearest example: the platform's value to an agency is the account structure that makes a multi-brand bundle operationally possible, not the send itself.