How many actual users exist that dont own another idevice or an iphone besides the ipad?
I'm one of those users! I don't use a phone or data often enough to justify an expensive 2 year smartphone contract (I work from home), but I do need a way to check in w/ email and do a little light work on the go. I don't own a laptop, either.
My iMac at home + iPad 3G + 14.99 data plan combo works great for my needs. I'm not generally an early adopter, but the iPad was the first device that really met my mobile needs, so I bought it early after its release and it has been perfect for me.