For all anyone actually knows, Elon is willing to lose a ton per launch just to gain mindshare, kill the competition, and become the only game in town. You know, the Amazon playbook.
For all anyone knows, the Boeing quotes are reasonable and SpaceX's are unsustainable. Nobody actually knows... yet so many are willing to confidently assert SpaceX is obviously cheaper.
> What is reasonably certain is that they likely will be profitable once they're not spending crazy amounts of money on development
This is a space race. The day when SpaceX no longer needs to spend "crazy amounts of money on development" may never actually come.