I think Nintendo bought the team for pretty cheap compared to this, even when adjusted for inflation.
And if I recall correctly a big reason for the purchase was because at the time there was a possibility of the team either being moved from Seattle or no longer existing if a bidder didn't pop up to maintain it there or something or other, and since Nintendo of America's headquarters is there they decided it would be a move of goodwill to acquire the team and keep it there (as well as obviously a solid investment)
The reality is it was a bit strange Nintendo owning the team and doesn't really do anything particularly for them moving forward, having it. The odds are not high that it will drastically raise in value any time soon and Nintendo has other endeavors to focus on
selling a property like that when you're going through a slowish year prior to the 2017 NX release is also logical to keep investors happy
