>Elon companies have the most expensive everything

The Model 3 and Model Y became the highest selling EVs of all time because they were the first below $50K to have long-range and be worth buying.

Until a few years ago, every other sub-$50K EV absolutely sucked.

highest selling is not same as cheap - apple also have the highest selling iphones among smartphones and they are still pretty much the most expensive (and usually not the best either these days).