Here's something you can do in your own home, or in some lucky offices:
1) Go to the refrigerator.
2) Open it and look inside.
3) Wow! You can see everything in the refrigerator in 3D! Do you care?
(Um, no... )
4) Okay, don't run away just yet. Notice the tasty beverages inside. Don't you think you deserve one?
(Um, sure...)
5) Reach in, grab one, and enjoy a beverage!
(Cool!)
6) You did that with your ability to view the world in 3D! Cool?
(Um, yeah, I guess...)
See, 3D matters a lot for humans because we need it quite a bit to interact with the world: to drive, to walk down stairs, to grab tasty beverages without spilling them.
But we don't need it to just watch things happen. It doesn't really matter then. If you think it would be cool to watch sports in 3D, just do this:
1) Attend a baseball game live
2) Wait for a someone to hit a long fly ball
3) Watch as half the stadium, who are watching it in 3D, jump up like that ball "is out of here".
4) Watch as outfielder catches it eight feet in front of the warning track. Whoops, silly us.
Even watching sports in 3D doesn't really enhance much; it only matters to the people who *actually have to interact with the ball*.