Maybe if I act on your summary recommendation ('focus...whole experience') with a better, professionally designed and effective landing page I'd make the process accessible enough for it to be evaluated on its merit rather than be dismissed merely for lack of understanding or interest.
To answer one of your other concerns, Zejoop is not native (yet) so there is no contact list integration (yet). In the interim you do have to enter email once for each new 'friend' you add - thereafter that friend remains in the Zejoop system, and you can invite by checkbox selection rather than text entry of address.
I can't tell you enough how much I appreciate your input here. It is golden, and actionable! Thanks.