It helps in materializing an opportunity rather than letting it go waste, networking increases the chance of ceasing the opportunity - one can benefit from.
Networking generates business hence increases the business of all individuals and concerns in the network
If one is not able or interested to entertain an opportunity, than simple referrals will give him the benefit even without doing anything by himself, so more referrals circulated among the networked people/entities
By connecting people and concerns - it multiplies and supplements expertise
Raises participants' profile
When you know people and their capabilities around you, it helps build confidence
Gives a sense of achievement
Spills Social networking and Friendship