people who want to use their iPad primarily for writing will want a keyboard + touchpad

people who want to use their iPad primarily for drawing probably won't want a keyboard or touchpad

I don't know why someone would choose an iPad for drawing rather than a MobileStudio Pro, you'd have to ask someone who draws on an iPad.

Personally, my iPad is purely a video and reading device, so I'm not the target audience for either. I'm guessing you aren't either.