Supporting iOS3 gets harder and harder every day. Now, when iOS5 is installed on lots of devices and iOS4 still being used, reason for supporting iOS3 is hardly to find. There are no official statistics of iOS versions, so the only way is to get statistics right inside apps.
There a bunch of posts in developers blogs indicating statistics of usage of different iOS versions. All of these stats approve that all developers should stop supporting iOS3 apps for main two reasons:
- Amount of iOS3 devices is really tiny;
- Users of iOS3 devices are less likely to pay for apps or use paid features.
Here is statistics from Macro Arment (Instapaper app) http://www.marco.org/2011/08/13/instapaper-ios-device-and-version-stats-update. What concerns iOS versions, more than 96% of devices are running iOS4.2. That is huge.
Judging by all of these numbers we can definitely say: iOS3 is dead.