If I travel, I take my Typecover with me, but I mostly work at home.
Let me put it this way: by having a computer (even if it has a tablet form factor, it is a Real Computer) without a mouse/keyboard, you give up half its potential (if not more, depending on how you use it). By having an Xbox without a Kinect you give up none of its core capabilities, just some of its extra navigational features and a distinct minority of exclusive games.
As a matter of fact, I think when the Surface Pro 4 comes out, I will not buy the type cover and take the savings instead. In any case, I really, really disagree that Microsoft is being sleazy by offering a choice. It's more like they're going all-in on the idea that you can use all of Windows without a physical keyboard.
But also because you have another keyboard and don't mind forking over money for a docking station or plugging in. You're replacing the type cover with another keyboard, but that's still something you had to buy.
> when the Surface Pro 4 comes out, I will not buy the type cover and take the savings instead
Microsoft has announced that the SP3 type cover will be compatible with the next Pro model, so you wouldn't have to at any rate :D
> In any case, I really, really disagree that Microsoft is being sleazy by offering a choice.
I agree with you, but I don't think they're offering the choice you think they are[1]. They bill it as "The Tablet That Can Replace Your Laptop," right above a picture of the products with the type cover on them. The intended use-case clearly involves the type cover.
[1] http://www.reddit.com/r/IAmA/comments/26m9cu/we_are_panos_pa...
In case you don't want to follow the link: the choice is the color of the cover, not whether or not to have a cover.