For the sake of argument, I will accept the piss premise (even though I've never noticed said smell in AFH).
Have you seen the pictures of the ceiling of the Sistine Chapel before the restoration project? Centuries of candle smoke and incense produced a layer of grime so thick that it took 5 years working 'round the clock to remove. Were the frescoes any less of a masterpiece before they were cleaned? No. In the same manner, decades of visiting teams pissing down their legs can produce an aroma so vile that R. Kelly would be offended. Now I axe you, does that make the venue any less of a cathedral?