There are lots of Google groups, even 100,000 members are in several google groups. But I need to know if these people really turns into visitors or just became a group member and never reacted. Actually being in a group help a lot to improve traffic for one's site and make it popular. I have experience with yahoo groups. Just I want to know if its the same for google groups?
If you contribute regularly to the group and then put in your link once in a while, then yes, you may get some decent traffic. May not really convert though, as nearly everyone in the group is usually trying to promote their own programs/products/services Be prepared for tons of incoming mail from other members in the group as well. This is the unfortunate trade-off.