Would having an optional version of the iPhone with a keyboard (or an optional addon, even third party) make Apple more money? If the answer isn't no, then the

Would having an optional version of the iPhone with a keyboard (or an optional addon, even third party) make Apple more money? If the answer isn't no, then the author's point has some merit, even if you prefer a slimmer device without a keyboard. Quick question: with all the third-party devices and addons that Apple permits via its proprietary iPhone/iPod/iPad connector, is there one that provides a mini physical keyboard? If not, do we know if Apple is intentionally preventing it (via API's or licensing)?