Musk hypes everything up, he loves attention and so he gets attention in return. Plus, Tesla is a growth company with a lot of legitimate questions regarding sustainability (see link below), so the investment analysts are going to talk about it a lot. There are reports on other car companies, but their are fewer question marks with established companies, and those articles don't get posted on slashdot.
Ever drive by those car lots that have the most flamboyant, garish, ubiquitous television advertisements? They are always full of people kicking tires.
There may be Space entrepreneurs strapped for cash and investors, but it ain't the South African.