The person on the radio who said that going to football is akin to going to the Opera is wrong.
When you go to the Opera or the Theatre the audience must remain silent for the cast to perform. At a football match the audience is actively encouraged to cheer thier to team help them to perform.
Don't think this parallel stands up: if the audience is too small for the opera or theatre, the show doesn't go on (I've had my ticket refunded as not enough tickets have been sold before) but a football team couldn't cancel a game if there are no spectators. Indeed Brighton were once forced to play York behind closed doors