Also Tesla does not 'need' to advertise, yet.

It is effectively advertised by everyone for Elon for near 0 dollars. Launch a rocket (different company) the article will mention Tesla for them. Talk about saving the environment guess who gets mentioned. Talk about power needs, Tesla comes up as cars are becoming a large consumer of electricity, solar, coal, nuke, etc.

His advertising is basically being done for free by companies who do not even really realize it.