New money has to come from somewhere, and if not marketing, then where?

Doge got the whole community to donate for the Nascar thing, and then had to sell it all for fiat in order to actually follow through with the donation.

Their whole model is based on deliberately weakening the coin by having charitable donations which dump a whole load of coins onto the market at once. Then again, it was created as a joke, not an investment. It has benefited the whole cryptocurrency community by bringing people into the fold who wouldn't have mined or spent fiat in getting involved, but got tipped on reddit and participated in mass give-aways.