A big reason is that AIO machines have a trendy and cool vibe to them. There is no denying they're great at launch, but quickly become obsolete. Only way I'd ever buy one is if it can be used as an AIO, or just a regular screen if it pleases you. It's bad enough something cheap becoming obsolete, but with the studio you have paid a serious chunk on the money on the screen, which is tied into (let's face it) fairly average hardware. I imagine if that screen was sold separately then every graphic designed in the business would probably consider one. I don't know sales figures, but I imagine the studio is not that hot a seller.
