Bahhh! You people! I think this is the definition of addiction. Wanting the same things over and over again!
He always has the right to say yes or no, for either private gigs or for tours or even for reunions. But he also knows that when he says yes, he has to take requests, for all three cases! If his tours were met with indifference and he saw half empty places, he would probably think of bringing back some DS songs, or quit touring altogether, or play smaller venues if it is economically viable...
I know it sounds weird (anybody coins for the word ethics, here?) but it hardly the case. He is proud for his older songs but the purpose of a tour is to please the audience AND promote the most current work. Now that he has more records as MK than DS, it would be peculiar to play the old songs and bury the new ones. Some more old songs have to go, since a new double record is out (in America quite recently) The purpose of a private gig is to play his famous songs. Let's not jump to conclusions. After all he offers so much and yet we can never be pleased. (I know I am, and I have only seen him just once live in 2008).