Tesla likely reasoned that they would have a huge up in Q4 and instead of having one quarter with profitability (Q4) they could spread it out and show two consecutive profitable quarters with even higher profits in Q4.
This may indicate they will be attempting to raise more money early next year, it's the kind of 'good news' that investors like to see.
Tesla's main costs aren't the cost per unit but the engineer/software costs iirc.
Tesla is constantly behind on producing cars for its customers. They just wanted to generate money now rather than later.
This has actually been Tesla's business plan all along: start with a low volume, high-priced product (the Roadster) and gradually move towards successively higher volume, lower cost models.