Because it's a damn sight easier turning up to the ground (when you like) with cash that is excepted in every day life all over the country than ringing up the club office (no doubt being on hold or engaged for 45 mins) before 1 (is it?), then spending half an hour queuing at a little booth only to have to queue again to get into the ground.
Also people would know they could leave it until the very last minute to decide whether they want to go or not. How many people watch non league football/play Saturday football? Where do these people go when their games are called off? Not to the Albion that's for sure!
What a HAMMER ON THE HEAD comment from Arthur. No wonder that clubs such as Manchester United and Arsenal have empty stadia every week, as they also refuse cash on the day transactions.
Of course the fact that Brighton Council have BANNED such transactions at Withers are an irrelevance.