Here's what their site says:
"photographik - the elite photographers network - lists only the most talented and accomplished wedding and portrait photographers in our Directory. Search by type and region and quickly find the best wedding and portrait photographers in the business.
Only elite wedding and portrait photographers are listed on our site. Membership is exclusive and granted only to those photographers who demonstrate excellence in the fields of wedding and portrait photography.
If you select one of our members to be your wedding photographer or portrait photographer, and please let them know that you found them on photographik."