I have one too actually, but I don't care because I'm not into paid ipad magazines.

There's only 15 million of you, if I recall correctly, and most of them have already coughed up more for the retina one. But there are 70 million iPad 2's and 3's, and I read on MacRumors that Apple expects to sell at least 10 million "mini" iPads in Q4 (not to mention a few more millions of iPad 2's and 3's, and a gazillion more iPad 4's when they introduce them), and almost all of them (except a few who are cranky about the maps, which would soon be forgotten when Google releases its maps app) are on iOS 6.

I too am starting a new iPad app, and it'll be iOS 6 only - because it'll be released early next year, and because it's really, really easier to only target iOS 6 as there have been many improvements in the APIs that literally cuts development time in half.