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
why do artists perform at the super bowl halftime show
The Super Bowl halftime show provides a rare opportunity for artists to promote their music and performing chops to tens of millions of viewers at one time.

Question: why did adele refuse
Self-contained rewrite: why did adele refuse to perform at the super bowl