Can you really not see a marked difference, even at modest viewing distances? I'm with you on the Monster Cable thing, but retina vs. non-retina is night vs. day to me. It's astonishingly better.
Retina Vs non-Retina at the distance i use my mini is, in real world use, so negligible and unnoticeable that its not worth bothering with, i usually have my mini 2ft from my head or more, at those distances retina vs non-retina disappears as the screen on the original iPad mini is already dense enough that individual pixels cant be picked out , so doubling the density makes no sense, as its a "lost gain" that just eats battery life/processing power unnecessarily.
If your using your iPad mini at 6inchs to 1ft like you do an iPhone, then sure, your going to notice the difference, your also in need of glasses because you shouldn't need to hold something paperback sized that close to read easily,