Tracking thousands of sites with google analytics

Tracking thousands of sites with google analytics

Our product allows our customer to create websites on their own using a
template website builder. For the purpose of this post, just consider our
product to basically do what Weebly does. We host all the sites and a
customer can point a domain name to our server to have a unique url, for
example, mydomain.com or whateverdomain.com.
Our system allows our customer to place his own google tracking ID into a
form field which allows the customer to track his site's performance with
his own google analytics account. Not all our customers will do this. In
addition to allowing the customer to use his own google tracking ID, our
company needs to track the performance the sites published on our
platform. This has been causing most of the problem for us.
The question is, how should we track the performance of thousands of sites
in our network? Some research has revealed that the best way to do this is
to use a separate tracking ID for each site. Obviously, this would require
us to use multiple accounts and profiles considering that Google limits
the number of profiles and accounts allowed. Other research has revealed
that it may be possible to use a single tracking ID for all the sites and
use dimensions and metrics to separate the sites. This does not seem like
the best approach because it would limit our ability to actually run
different dimensions and metrics on the sites that we are tracking.