Your last point is important - for many people the Surface tablet isn't competing with the iPad, it's competing with the MacBook Air. And it's already winning on price there.
Perhaps an exception that proves the rule but I bought my macbook pro 13" at 1300€ in 2009 because it was significantly cheaper then the competing offerings (IBM thinkpad and Dell E series)
How is it winning on price vs. the Air? The 11" Air starts at 899 vs. the Surface 3 with similar Core i5, 4GB memory, and 128GB SSD hardware that starts at 999. Add the $100+ keyboard cover to the Surface and it's an worse comparison. The 13" Air is 999 and again comes with the keyboard of course.