It needs to be known DOGE is just a crypto into BTC. Not just DOGE. 1DOGE does = 1DOGE, but 1DOGE=X btc and we need X to be greater than market price atm (or I would assume everyone who has a DOGE position wants this.)
People also love BTC because there is a cap. No one (unless they think they can make a quick buck now) wants to spend their capped coin on a uncapped coin. You can advertise this into the dirt, but it can not make it like this.
What cap? The one that will be reached in 2100?
Or because people are realizing that the money keeps getting put in the wrong advertising campaigns. These races haven't done anything for the coin as far as I'm aware. You really need to focus more on things that will bring in more nerdy types; in general, the people that go to the races aren't people who even understand cryptos. Much less want to invest.
Imho, this was not a bad choice of advertisement campaign; the absurd aspect of an über-geek concept sponsorising a "redneck" thing is what allowed us to have way more exposure than the 55000$ would have given us anywhere else. It's also great that it was something concrete - a car - rather than simply putting our logo on some billboard or whatever, this gives more credibility to cryptocurrencies' ability to have a real impact in the world and that they are not simply "magical internet money".