On Nov 9, 2011, at 7:42 AM, Daniel Florey wrote:

> running as a multi-tenancy app is not doable for several reasons:
> - Clients want to be able to protect the data by managing the permissions 
> (=access to the datastore) by themselves

I suspect that this desire would be gated by cost. That is, for customers who 
want to do this, they pay $15/month ($9 to google + your fee). For customer who 
can live without this control, you offer them a cheaper version that doesn't 
have this ability (the multi-tenant version).

> - The app can use a lot of resources depending on the settings of the 
> customer. I don't see a simply way to charge them for the resources consumed 
> when using a multi-tenancy app

If it were simple, you wouldn't have a business. :)

Seriously, though, you could easily apply caps on the user's settings or usage 
when they opt in to the multi-tenant version, and if they need to exceed those, 
they bump up to the private $15/month (minimum) version.

-Joshua

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