Things I Don't Get: iPhone dSLR Mount

OK, everyone knows that the best camera is the one you have with you and that frequently the camera with you is in your smartphone.  But really......does this make sense to anybody?  Is iPhone-ography being carried just a little too far?  An iPhone in one pocket and, say, your 24-70mm f2.8L in the other just in case you see a photo op while walking down the street?  If I am carrying around the big lens, I suspect I am also going to be carrying the big camera!

Oh, and if you are really interested, you can buy the iPhone DSLR mount here.

Disclaimer: I have nothing against photojojo.com.  In fact I think their store has some really cool stuff.