This model provides access rather than ownership. An idea can be to make a service like peerby. Some people own kiteboards and some don’t. Service like peerby can show which people are not using their board at a certain moment and want to sublet it. In this business model people pay for the service application.
Another possibility could be to create a subletting service to upgrade your kiteboard whenever you want. A lease system will provide acces to different kind of boards. In this way the user can easily change boards if he wants a new one. He will pay a certain amount of money per month for this service.