Why is a single tour cost more expensive than a twin tour cost for overnight or extended tours?
When a tour involves accommodation and 2 people are sharing the same room the per person cost is less because the tour operator is getting 2 people on the tour instead of 1. When the tour operator only gets one person booking a tour and occupying a room all to themselves they need to charge a single supplement to cover some of the deficit lost by not having the revenue from the second person on the tour.
