you should be watching for cheaters
seriously though people re-direct alot IE once a site is listed they re-direct to a paysite.... people multi-submit and try like hell to hide it.... some people change sites after they are listed to add viruses/spyware, remove the content, add tons of outgoing links etc... and there are a bunch of ways that people cheat but LL owners aren't gonna explain in public how they track them down or the cheaters will know how they are being busted and will come up with new ways to try and cheat