My sister has an iPad 1 she got handed down to her. She's frustrated that she can't update to iOS 7, which means she can't get a lot of the newer apps. When Best Buy had its "we'll give you $200 for any tablet" promotion again, I told her to either get an iPad mini, iPad mini WRD or iPad Air. She doesn't want the mini because she likes the bigger one.
I just made sure to tell her NOT to get the iPad 2. It will obviously be the next one to get support dropped, and I don't want her going through that again within a year or two after spending $200. I can only guess that the iPad 2 sells a lot in bulk. But I honestly don't get why Apple didn't make the iPad 3 the $400 iPad because it has a retina display and I believe has the same guts as the iPad mini.