I released my first real experiment http://itunes.com/apps/fastlists (yes it's another lists app but it is currently free, with no ads and has a couple of useful features making it especially useful for reusable lists for shopping, packing etc. The design is functional rather than beautiful).
I'm currently adding some in-app purchase options to test the reactions of the users.
My current idea is to offer the following options: (price tiers equate to $1 or local equivalents I think)
1) No-ads (tier 1 price)
2) Privacy - No anonymous usage collection.(tier 1 price)
3) Raise item limit (by 100 to 200 items) (tier 1 price)
4) Unlimited items (tier 3 price)
5) Everything including future in-app features (tier 5)
For me option 5 is important because I hate feeling I will need to keep paying bit by bit for something. It will include everything that doesn't need server side support and expense. I actually hope most customers choose this, the other items are there largely to justify the pricing of this item.
Ads and anonymous usage monitoring will come in releases after the purchases have become available as I want to give people the option to opt out first and for ads I will probably make the first month of use add free to try and get the user stuck in. I may also add some alternate skins as in-app purchases too later although that is lower priority than using the iOS 6 social framework as a way to try to get users promoting the app for me by sharing lists.
There is currently no item limit so I will allow existing users who installed before the limits were introduced to have unlimited items on the devices they have already installed on.
At the moment this is just a small scale test because I haven't done any promotion for the app yet so the current numbers of users is small although the reviews are currently very good (4.5* average in US and UK).
Any thoughts on the pricing model? Or the app?