Small displacement bikes nearly always cost less to run and maintain than larger displacement bikes. They use less oil, the tires are (way) cheaper, many parts cost less including chains (skinnier and lighter duty) brakes (smaller pads, fewer pads sometimes), get better fuel efficiency, etc.
I have a 250 and a 750. The 750 costs about twice per year to run/maintain than the 250 and they see fairly equal miles.
You couldn't hear a dump truck driving through a nitro glycerin plant!
Badasses might screw with another badass. Nobody screws with a nut job.