Also, the lack of options. It's much easier to buy from Apple or Tesla (even though I don't use any Apple products except a Mac Mini), simply because the number of options are less. At this point, I don't know the difference between a Vostro, a Latitude and an XPS.
I don't know where you live, but in France there are plenty of Apple ads. Some are run by third parties ( e.g. telecoms advertising you can get the latest iPhone with them, mostly in the form of a huge Apple ad with a small logo of the operator actually advertising ) but most are not.
No ads and no price haggling are big reasons why Tesla is so popular.