I to have never seen one out in the wild. Not SP 1/2/3. I go to university half time, work plc programming and troubleshoot, and amature photo/video taker. I see the Best Buy employees with them, but no one else at all. I've been on board since the SP1. For school/work, its invaluable. Full windows, tablet, pen. Out in the field, pull it out of my 'purse' (wife calls it), take notes, import a new reciple/program into machine, take pictures/videos of machine (for faults ect).
I mean, the guys next to me have flipboard and notepad, with laptop backpack. They take their notes, monitor temps ect, then set backpack down, pull out laptop, then stand up and play this balance the laptop in your left hand while plugging it in to import a new recipe, then sit back down, pack the laptop back into backpack, swing backpack back on, then finish with notes.
I blame marketing. Price I don't think so much. MacBook pro proves that people are willing to pay a premium for a premium product. And that a lot of people want a premium product. Type cover, yes should be included, but w/e. For $130 its the best darn keyboard ive used for a tablet.
But I think with broadwell or skylark in the next SP4. That will be their 'nitch' product. Battery life galore and fanless. Release the 8' with pen support like they were ready to but pulled out last minuete. And honestly I don't know what more actual professional users would want. MacBook pro has its uses, its a really good laptop. But a workable tablet is a whole separate area. If I had to choose between my MacBook pro retina 13 and my sp3, it'd be somewhat saddingly be the sp3. But only because it can be the other, laptop. While the MacBook cant be the other, tablet. But having both, best of both worlds.