50% - yes
50% - no
The success of a project doesn't depend on its advisors but on the developers themselves.
Then it should not be 50/50, advisors are just part of the recipe but it's not a major recipe that could help the project to grow.
It might create some hype when the advisor is popular like Vitalik Buterin, but the long term success of the project still depends on the team who handles it.
In the past, there some projects that have a great advisors but I am not seeing them now.
Project will grow and will become popular when after the launch they will have partnerships on popular blockchain company because it could give great exposure to the project and therefore investors will see their potential.
But with the past projects that I've seen, the projects are boasting on who's their advisor which I think that helps them to market the project by simply buying the name of the advisor and including it to their project's developers name.
Believe me, the work of developers is very important, but in addition to it you need to do other very important work for the success of the project.I do not think that advisors have too much influence on the project's progress.There are such startups where there are more advisors than a team.This is clearly not right.I think one competent marketer and manager is enough.
Well, the main workers of a project are the developers themselves. If the advisor is popular, then the project will show their investors that they have included that popular guy to their project as an advisor which can attract more investors. That's why I think it's 50/50.