[stevenkovar]

That's similar to saying a toddler is less productive than a recent college graduate.

That is to say: WhatsApp is much further along its individual trajectory than SpaceX is. In decades, the value of SpaceX is likely to eclipse WhatsApp, which in all likelihood won't even exist any longer.

[aclements18]

In this analogy you seem to believe the trajectory for this toddler is set in stone. The reality is at it's infancy (which is where Space X is in the grand scheme) it can look very promising but turn out very bad, or a competitor can drastically outpace. Any valuation should discount for the level of risk.

A lot can happen over time. 10 years ago MySpace was by far the dominant social network and Blackberry was the mobile powerhouse. Seemed like neither would fall with so much momentum behind them but we see how that played out.