Lots of people buy laptops for use in their bedrooms or on an occasional trip to Grandma's house, others of us are road warriors who have to lug these things around on a daily basis. I don't want some bulky laptop or chunky tablet that looks like it's cheaply built. I want a thin,light, sturdily built device & understand that these things come with a premium price tag.
As an example, I had an Asus Transformer and liked it, till I had a chance to work with a 10.1 Galaxy Tab, in day to day real life use the GT was more pleasant to use, the extra features offered by the TF was not enough to offset it's extra weight and the fact that the edges of the thing were sharp enough to make holding it for longer periods of time uncomfortable for me. Form factor & build quality do matter!
Btw, I'm one of those people guilty of using a tab to snap a pic or two with it at an event, LOL ,given a choice between holding the tab in one hand and my phone in the other, I'll hold the tablet and keep my other hand free for snatching up drinks and apps