Much respect. I'm only curious...
EDIT: Whoops, I misunderstood the meaning of freemium.
Here's a good article to consider: http://blog.priceintelligently.com/blog/bid/188339/Screw-Fre...
You have a team of 9 people and you've been working for 2 years - presumably costing well into the six (seven?) figures by now? Outside of Angry Birds and such, making serious money is pretty difficult in the App Store these days. Freemium for something as personal as a diary is tricky, since advertising is obviously a no-go - are you charging for the hosting? Is there a time limit?
I'm just a solo dev working on (and promoting) apps part-time, and you're VC-funded and have a whole team including someone who was "head of revenue for CityVille at Zynga," - so presumably you have something clever up your sleeves. I'm just curious.
I'm sure Momento and Day One make good money, but that much?