The scenarios may be different, but at the end of the day we are talking about a person voluntarily taking less money.
I know players have done it for a variety of reasons, and I'm confident some of scenarios include future undisclosed considerations and or were done with a specific plan in mind i.e. hey Book take 50 instead of 70 and we can bring in Embiid.
My point is simply, Booker would be dumb to say, hey Ish thanks for the 140 million dollar offer, but I'll take 100 to be fair, and we shouldn't expect him too.
I wonder how many fans here have been offered a 40% raise by their employer, with no additional work requirements, and turned it down.