Bounty hunters have a big influence in promoting an ICO project, most investors choose projects that have many people promote it and having many bounty hunter also raise the credibility of an ICO project.
limiting bounty participants won't solve the problem of dumped prices when ICO tokens enter market, limiting participants have a good and bad impacts, if limiting for choosing the quality of participant who promote it than that's good, but if they limit the participants based on who registered first then it just the same, since quality is better than quantity.