The reason the iPad2 continued to sell even after the introduction of the iPad3 is because
1) most people can't tell the difference between retina and non-retina displays
2) the battery life and recharge time were worse on the 3, leaving many people (including myself) recommending that people by the 2.
2) the battery life and recharge time were worse on the 3, leaving many people (including myself) recommending that people by the 2.