1. How influential is this bounty participant for a new project?
Bounty participants has a big influence to spread awareness for the project. If many people participate to promote the particular project then there's a chance to gain the attention of investors especially if the project has potential.
2. If the bounty participant is restricted what will affect the success of a new project?
Sometimes its not about the number of participants, as long as the project itself has something to offer that can attract investors to trust then it will succeed.