You specifically referenced a line from the post you are replying to as such:
> > They make a net profit on their cars, but they are currently investing it all into aggressive expansion
> Citation needed.
The citation is right in the statement. They make a gross profit, which means they make a profit on their cars. The in turn spend more on activities that do not involve getting cars to customers. The activities that cause the company to have a net loss are not "cost of revenue" activities. Presumably the majority of that non-revenue expense involves expansion of the company.
I agree with, basically Musk is hoping that investors won't lose confidence in the company for several more years.
However, this model has so far proven worked with Amazon and a few others and I think there is enough shareholders willing to keep the stock that long.
Tesla could stop ALL R&D they're doing and they will still be an unprofitable company.