Networking is not a numbers game; you need to focus on quality and not on quantity. Some people think that they had a successful event when they have collected 30, 40 or more business cards, but they are missing the real point. How many of these 30 or 40 people will you be able to follow-up? How many of these 30 or 40 will follow-up with you?
What is the purpose to collect a huge number of business cards that will end up in a shoe-box on one of your shelves?
Networking is not a place to sell. You have to be prepared to give your elevator pitch to introduce yourself, not give a sales pitch. If you attend an event expecting to find a client to close a sale right away, chances are you will be very disappointed.