Re: Simple
If that were true, how come the iPhone sells so well? The only difference is a radio chip, costing a few dollars at the most, and possibly an LED flash for the camera. Oh and the iPad is 4 times the size, so has a much more expensive screen and battery.
Actually I've used the argument of tablet prices to say that all the top-end phones are over-priced. Which I believe they are, so I won't spend more than £200-£300 on a phone (and there's some pretty good ones at £150).
But the 10" iPad isn't significantly more expensive than the premium Android tablets. Until you pay Apple's rip-off price for extra storage of course. Or in fact the £100 extra they charge for the one with a mobile radio chip costing a few dollars...
I'd say it's more likely that tablets often get left at home, and don't take as much of a hammering as phones, in battery or getting dropped terms. Plus lots of people still expect a shiny new phone with every new mobile contract - whereas they're paying the price of the tablet up-front (not as part of a disguised hire purchase and airtime contract).