When employees have the power to vote for the employee suggestions they agree with, they're empowered. Although each employee can only vote for each suggestion once, let our powers combine, go planet!
When a company reaches a certain size there is a lot of communication. For those at the company that are decision makers it can be hard to find the signal with all the noise. Employee suggestion voting can help executives and managers see the popular concencous across the organization. By turning this employee information into knowledge it's much easier to see where to steer a company in the right direction.