In one of Sandy Munro's videos, he said he thinks Tesla can manage costs of $19K. The size of the market increases dramatically as you go down the price curve, which makes a $6K profit per car plenty interesting.

That certainly seems to be what Tesla thinks at least, unless they were completely lying to investors about the volume they hoped to achieve.

Why invest 200 million USD to make 1 billion when you can invest the same to make 10 billion? The problem is that expanding isn’t free, you take the most probable business first. The low end is growing rapidly, but the players already there will ensure that Tesla doesn’t make $1k of profit per vehicle. They can’t compete with a Wuling Mini EV for $4k, or whatever BYD has up to the model 3 price point.

I don't see many Wulings for sale in the US, and Tesla is selling plenty of Model 3 in China.

Tesla did take the most profitable business first. Now they're expanding to the mass market. You might disagree that it's the best strategy, but it's the one they're following; if you don't believe me, just watch Investor Day.