Not enough demand to make it worth the effort. Making a screen tablet is really hard. The iPad is general-purpose enough (and does not require a stylus) to mak

Not enough demand to make it worth the effort. Making a screen tablet is really hard. The iPad is general-purpose enough (and does not require a stylus) to make it worth the effort (and price -they ain't cheap), but a specialized one would likely fizzle, due to a limited customer base.