I would be interested in knowing just how many of these "helpers" actually finished and contributed something that will be in the final game.
The idea that some folk are willing to help out is respectful. All the power to them.
Contributions and ideas are filtered into the committee and may not go into the final project for a couple of reasons.
1. The ideas aren't interesting or necessary
2. The designs are poor
You could, yourself create some code or what have you and maybe make some nice sound files, but if the project manager dont like it! it aint going in!