WeTravel's marketplace uses an algorithm that ranks trips by popularity (e.g., number of participants joined, volume of funds transacted on our site, 'likes,' past trips from the same organizer, feedback / reviews).
While it is possible to create a public (marketplace) booking page without the intent of using it to take registrations and payments for the majority of your group, the marketplace is really intended as a resource for our system's users. With trip pages that sit static, there's always a chance of bookings, but it's far less likely. If each of your participants register and pay for their trips via our site, the activity will improve the ranking of your offering as well as give prospective joiners more confidence in signing up for a trip that seems to be filling up and gaining popularity!
We have designed our marketplace this way with the intent of putting our best foot forward to those searching our site. Giving highest visibility to trips that have already gained traction and are offered by vetted organizers increases the probability that we're able to match prospective participants with the best travel experiences possible.