It usually does. You will pick up the knack much faster than you would expect. And it is necessary that you provide leads to others just as they provide them to you. It is an open and fair exchange of business assistance. The practice of limiting membership to one person in a given profession is partly to ensure this.
Most groups also have listings of the types of businesses that benefit most from networking.
It is not in anyones interest to have one-sided trades going on. Also, if for some reason you are not getting the leads that others receive, the better groups will have programs in place to help focus the other members on finding you business. These organizations work best when they work openly for everyone. They will be recommending the new members to family, friends and business associates. Each of these people puts a certain amount of their reputation and their relationships with others on the line each time they recommend someone to them.