Tesla is now running at $1.5 billion+ annually, and growing.
For 2012 they had revenue of $413 million at a loss of $396 million.
What's your beef? Seriously curious.
So you really cannot use last year's numbers for anything, and therefore last years revenue/income is completely irrelevant.
The 1.5 billion comes from estimating what this year's revenue will be based on the number of cars they currently produce/deliver (which is in the 4-500 range). It is based on about 7500$ profit/car and 20000 cars/yr, but in fairness, that is just an educated guess.
Given that they are now profitable, the key questions are: How large is the profit-margin really. If demand will keep up and allow production to increase. Is there some yet to be revealed gigantic technical issue that will require Tesla to call back all cars.