[Hammer]

30 is way too many. We went with 10 when I was running Klixxx but you still run the risk of running off new members. There are lots of legitimate reasons for a new member to post links like asking for a review of their site. So, I think it's a good idea but you need to come up with a number that doesn't require someone to spend a week posting quality posts or a day posting useless bullshit so they can start posting links.