Something like football or chess or Formula 1 is valuable in itself; there's a beauty and elegance in seeing the hard thing done well.
In poker even the thing you're celebrating is zero-sum. Could person A fool person B or could person B read them; that's not people collaborating to create something in the way that two tennis players beating out a long rally are, that's just A vs B. And so much of the game is simply random luck - does the right card fall or not - and that's what people want to see; you might say there's skill in the game and that might be true, but people don't watch poker for the chess moments where someone makes a brilliant move, they watch it for the moments when the right number comes out of the random box. The larger luck factor matters.
In poker even the thing you're celebrating is zero-sum. Could person A fool person B or could person B read them; that's not people collaborating to create something in the way that two tennis players beating out a long rally are, that's just A vs B. And so much of the game is simply random luck - does the right card fall or not - and that's what people want to see; you might say there's skill in the game and that might be true, but people don't watch poker for the chess moments where someone makes a brilliant move, they watch it for the moments when the right number comes out of the random box. The larger luck factor matters.