Conversation so far:
how much did nbc pay for the rights to broadcast the super bowl 2018
It's reported that CBS, Fox and NBC will pay around $3 billion a year collectively to broadcast the Super Bowl.
how much do singers get to perform at the super bowl halftime
Super Bowl halftime artists are not paid to perform

Question: why do artists perform
Self-contained rewrite: why do artists perform at the super bowl halftime show