God - you'd hate to watch me. I'm always taking my hand off, flipping the guitar over, throwing it around, lifting it up. No there's no need, yes it makes me interesting/fun/cringey to watch (delete according to preference). But I promise you this I only do it because I'm into the music and I cannot stand or sit still while I'm playing.
Obviously being the bass player I have a duty and resonsibility to be the coolest person in the band - I know that, but that doesn't prevent me from being a showman.