I beg to differ on sports events. They are private events that charge admission that are held on private property. Therefore, they may allow or not allow microphones and cameras for profit or not as they see fit. The King speech was held on publicly owned land, The Washington Mall, no admission was charged to witness the event, and hundreds (if not more) of cameras and microphones were present without anyone's permission.
Maybe this is a poor choice of terminology on my part.... but you make the comparison a bit more black-and-white than it may be. Many of the stadiums are built with at least partial use of public funding.
And SHAME on MSNBC for paying (apparently) a lot of money for something that is a part of history, should be considered fair use and in the public domain.
What if MSNBC was in the mood to consider part or all of the fee a donation to a charitable organization. Would it not be condescending on your part to tell them they shouldn't do that because it does not meet your definition of how the system should work?
There is no need to be condescending in providing non-answers.