This already happens to some degree; it's very common for web design companies to also handle hosting and mailing lists on behalf of their clients, and there ar

This already happens to some degree; it's very common for web design companies to also handle hosting and mailing lists on behalf of their clients, and there are plans built specifically around this kind of need. Back to you example, you are doing the market segmentation and sales work for SEOMoz, so I don't see why they would mind. It's better for them to receive $299/month from three users than NOT receive the same amount from one user.