Gas costs are negligible on a motorcycle, I pay at most $20 a month for premium (91 or better) gasoline... The economics of an electric bike just aren't there yet while they remain above $10k for the base models.
As much as I'd love to own an electric bike,vlike a zero, they're still in a premium early adopter phase that I can't justify yet. A good comparison would be the model s vs 3.
Speaking of, it's a shame Tesla won't make an electric motorcycle.