The "problem" is Tesla is trying to become the GM or VW of EVs before GM or VW get a chance to use their massive cash cows to dominate the market. So they're trying to cover the market with as many different models as their financials allow them, as well as trying to build the SuperCharger infrastructure globally. All of that R&D and infrastructure costs a lot of money and it has to come from somewhere -> current cars' profits.
To make things even simpler to understand, Tesla will operate on an Amazon model of not giving a damn about quarterly profits for the next decade or two, while building the biggest (Tesla-only) fast-charger network in the world (huge competitive advantage) and at the same time trying to grow as a company as fast as possible and entrench itself in the car market as the Apple of EVs.
Oh, and almost forgot about the whole Gigafactory thing. And one of those isn't even going to be enough by 2020 (don't forget it also has to make PowerWall batteries). That alone cost $5 billion and Tesla couldn't even build it all itself (just goes to show how much money Tesla needs to invest in its future, not pay dividends or brag about its 30%+ profits every quarter).