First, many networking group website limit the number of businesses represented in the group. They may restrict the real estate agents to one, the printers to one, the insurance agents to one, etc. Others may not restrict the membership. The type of networking group you choose is definitely based on the number of referrals you receive.
Don’t expect that if you’re the only person representing your industry your road to more referrals is guaranteed. Nor is there a guarantee that the referrals will be a high quality referral just based on your exclusivity in the group.
You should choose the best networking group based on the referrals you receive. Take all costs into consideration, but always remember that the referrals should bring more income to your business than the costs. Membership costs are simply a cost of doing business. Networking group can improve your business contacts and your sales skills, thus you will continue to build that business relationship with them.