Because the Sun is a selfish bastard, that's why.
Just like that horrible human being who refused to give me $500 when I approached him for spare money today. I told him I was hungry, and needed a bottle of wine, and a pack of cigarettes, and some money to gamble with, but nooooooooooooo. I know he had it, too, because I went upside his sorry head with my 40 when he tried to walk away, then took his wallet. What a miser! A true misanthrope, with no regard whatsoever for his fellow man.