Promotion costs a lot can be more expensive than the development of the project itself, because now without advertising is not one project and does not live long on the market
In the case of project Greencoin, promotion can be much cheaper and easier because the project plans to work in the field of environmental protection and many people are willing to donate development assistance to the project.
here advertising is not so expensive, but still it is, it needs to be done to the target audience for the result