As company that promotes KS campaigns, I'd love to hear your feedback on how effective your campaigns were.
I know of Backercamp and have worked with Thegadgetflow and Kickrank and they are great!
My suggestion wouldn't be just to go for the big numbers and hope a huge email blast would generate some interest.
I think marketing needs to be focused. For the Jabber, it's all about kids - but more importantly, it's about connecting with parents who have the ability to back you. Finding influencers who promote to adults, then showing them why they should mention/back you and let the traffic grow organically.
You can't really force people to pay attention to your campaign (not saying you're doing this, but I'm meaning in general) as it will turn people away. They need to feel no pressure in looking at your page, have their questions answered as they're scrolling down and feel like they trust you enough to back you.
If you'd like to talk further, I can talk about how I'd promote Jabber
Good luck with it.