I do see the point of the OP.
For example, I have the iPad 3. I am tempted to go out and buy the mini, and then once the mini 2 comes out, hopefully with retina display, I'll sell both the 3 and the mini 1 and have the mini 2 with hopefully some cash to spare.
However, and this is a big however, my wife doesn't see the point of having 2 iPads and will give me grief about spending money foolishly. Yes, this will only last a day or two, but believe me, it's not really worth it. So I'm thinking of buying the mini and selling the 3 now, but then I think about "well, if the mini 2 comes out this summer or fall and it's got retina, and I have to sell the mini 1 and then still pay out more cash on top of it, that will suck."
Because, you see, I must have the latest and greatest if it means having a significant upgrade. Once the ipad 4 came out, I didn't care TOO much because the screen resolution hadn't changed. But the mini with retina will be a big upgrade to the mini without, so. . .
. . . . . . .And now I'm aware that I just rambled and no one read this, so I'll just slink back into the shadows.