Nikola Motors, a Tesla competitor with zero revenue, is worth $23 billion. That doesn't faze its founder. (NKLA)

· Nikola Motors is worth $23 billion despite zero sales or revenue. 
· Founder and chairman Trevor Milton told CNBC that's because investors "don't care." 
· Instead, they care about reducing emissions and the promise of Nikola's technology. 
· While Tesla has its eyes on a battery powered semi-truck, Nikola is eyeing...