Ticket sales have been so poor that the organizers have effectively given up on persuading Brazilians to buy more than a fraction of them .
Paralympians have taken matters into their own hands with a crowd - funding campaign .
Ticket sales have been so poor that the organizers have effectively given up on persuading Brazilians to buy more than a fraction of them , so Paralympians have taken matters into their own hands with a crowd - funding campaign .