Of course good advertising will result into a good hype of the project,good hype attracts more investors and it will make the project's success too easy.Projects with less advertisements will surely wont have any good chance to get good investors for their project,bounty hunters really has big part of the ICO's success that is why these ICOs are allocating big for the hunters.
So does this mean that a project with a great idea and a team of great developers behind, but without a proper funding, won't eventually succeed?
it can happen, even though the idea is very good but if it is not funded properly and systematically encouraged it is equally useless. because to promote a project requires a large budget.