You're clearly wrong. Firstly, there were about 18.5k Brighton fans today, so that's not 15k more. I had a season ticket at Withdean for several years, but not for all of them, so I didn't go to half the games there, and there are plenty like me that went to Withdean loads, so it's easy for us...
Why? The crowd in the N/W corner were pretty decent, a fair amount of singing, but the second half performance was poor which didn't help. I stayed to the end, but then I didn't have a train to rush to etc.