I don't think celebs owe us anything.
To use the same example of the waiter. He get's tipped after his service. If it's good... he gets a good tip... if not... then he doesn't.
The same goes with a performer. If they do well then those that like their music/acting/etc. will pay to see them or pay to buy more albums. The music lovers reward is that they have a piece of art they get to enjoy.
If you buy a painting... you don't get to decide what the artist does next or get to feel they should do certain things for you. If they choose to stop painting... well... you just can't buy anymore.... and they don't get paid anymore.
When Garth was performing... he really gave it his all... maybe a little too much than he should have since he neglected his family in the process. In return he became very successful. While he was performing or promoting an album, he also spent a lot of time giving back to the fans with autographs and talking to them after concerts and at the gate of his home.
He's not performing (other than charity) now... and he's not selling or supporting an album... so people aren't paying him for anything... but he still meets and greets with fans when he's able.
So if anything the people are getting a bonus as he's given more back than he had to.
Garth the waiter has quit working at the resturant.... and isn't paid or tipped anymore. So why should the patron think he should still come in and serve them? It's actually amazing that he still does and he does it out of appreciation for the fans. We got a bonus dessert I guess you could say.
If it's a matter of the celebs owing the fans even long after they've performed a work of art or sold an album...... at what point does it stop? Do they owe us forever? That's not work... that's slavery.
But you've got to be tough when consumed by desire
'Cause it's not enough just to stand outside the fire