Yes.

There is a cost of $10 to join Opportunity Dock.  This covers you for 6 months membership.

The payment is broken into two parts.

There is a Membership fee payable to your sponsor of $6.  Every member here has a sponsor.  When you found Opportunity Dock, you were referred here by a sponsor.

The remaining $4 is payable as a Subscription payment to Opportunity Dock.

Once you are a member of Opportunity Dock you can refer other members and become their sponsor.  So for each new member you invite you will be paid $6 direct into your paypal account.