I'm not sure how you did that ....... but what I did was:
2000 fans at sixfields at £16 per game + £3 per head F&B = £32000 + £6000 = £38,000 per game.
9000 fans at Ricoh at £22 per game + £0 per head F&B = £198,000 per game.
23 home games a season makes it:
Sixfields - £874,000
Ricoh -...