Makes sense - by all accounts even if theres a sizable number of people with buyer's remorse and decide on refunding their $99 deposit, it's clear any inventory will go within days. National media campaigns are really pricey, and those who buy the first models in the US will end up repeating the words "smartusa.com" over and over and over again.
It's actually much the same for many of the other popular, but still niche cars. Anyone seen commercials for the Mini? Toyota is only mentioning the Prius in their ads as part of a branding exercise, not to sell a car that still has waiting lists.