I just got a presentation offering me to become a "partner" of a local portal. What this means is that people who register for their webmail accounts there can opt-in to register with their partners simultaneously. The fee per registered user is negotiable.
I was wondering what experience other people have with this type of arrangement. In particular, I am interested in the "quality" of this kind of co-registered users, compared to the group of users who register directly in my site.
By the quality I mean the shopping habits and churn-out rate of this type of co-registered users.