I don't think anyone does, it's just the additive effect of 30,000 people blowing them at random intervals is a constant buzz (particularly on TV, when there's no direction to the audio).

I expect that this is akin to wondering why anyone would want to go to a concert and lay on their camera's flash for two hours to create that annoying "continuous strobe" effect. :)

Only one way to find out: try it yourself :-)