Again, this is short sighted. I'm not criticizing you, I'm criticizing Tesla.
Yes, you have to fund that entity. But in the long run, it more than pays for itself. Again, this is proven. It is much easier to keep current customers with good customer service than to have to pay to innovate to keep them. Innovation is hard, and it is expensive. And you have a growing number of companies entering the market every day to come steal Tesla's lunch. Yes, they are way behind. But eventually, these products will start eating into their sales.
Again, I'm not making this up. It's well researched, documented and proven. And by combining constant innovation PLUS excellent customer service (hell, even basic customer service would be an improvement), you'd have a dynamite combination and it's just better overall.
Look at Chick Fil A. Their product is inexpensive and market competitive. Arguably, it's not even as good as other competing products (the Popeyes sandwich is better). However, look at their customer service. That takes money to train, but they see it as valuable and make the investment. All to sell you a $9 sandwich meal. And people return and are loyal because of it.
So if CFA can do it, Tesla certainly can afford to do it.