Motorcycle heads: what good does revving several times before taking off do besides make a shitload of noise & wake the neighborhood at 2 or 3 am?

Dig! You get into a car or truck, turn the key to start it up, maybe sit there idling for a moment before you drop it into gear and take off. A number of people these days just get in, turn it on and take off!!
On a motorcycle, you get on, turn the key, start it up and then sit there revving the shit out of it for 5:00 before you actually put it in gear and ride away to the nearest gas station because you just used up your entire tank revving it up.
Motorcycle heads: what good does revving several times before taking off do besides make a shitload of noise & wake the neighborhood at 2 or 3 am?
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