Thanks for your feedback.
That is a policy of our travel partner, Maranon Experience. Rafting the Maranon in style - Marañón Experience: Raft
We believe that is the industry standard for international rafting and adventure trips, so that people get the level of insurance that is right for them depending where they are from, which can also include their travel to and from their home country.
We are an NGO, so the whole idea behind this particular Remando Juntos project is to enable local people to get involved in protecting this river. This means taking local photographers, scientists journalists etc. Definitely it is a kind of sponsorship, we hope participants may go a step further a raise more money to support our larger campaigns too, we need a big community to save this river. We are hoping there are people out there who see this as more than just your average vacation or trip down river; it's a chance to get involved in a meaningful way. Really positive stuff!
If you want to do a trip just for yourself, you can book directly through the companies that are running this river. Our partner is Marañón Experience, Rafting the Maranon in style - Marañón Experience: Raft
But you can definitely find others out there with different prices, levels of service and itineraries.
We hope you make it down there one day!