This is normal, Old devices gets leaves behind. It is just impossible for Apple yo keep up with all devices. Plus, I am sure of that apple has tried putting the ios7 on ipod touch4, however the experience is just too bad i suppose. Dont forget that the ONE thing that apple focus the most is iser experience, they will not release anything that delivers a really bad user experience. I have used the ipod 1, iphone 3g,3gs,4s and all the way now to 5. My ipod 1 and iphone 3g and 3gs has been great devices, and i believe that they do not get ios7? and now, if you think ios devices are expensive, just to tell you, i am a student and i get my iphones from working, plus you can sign contracts with phone carriers to get free iphones, i dont see the point of something it too expensive.