Hi jonah,
I'm sorry that you were disappointed on this occasion.
In answer to your question as to how we decide, there are a number of things that the team look at to determine whether or not to cancel a tour such as:
The current number of travellers booked
The take up on tours to similar destinations
The take up on similar dates
Operational changes that have to be made since the tour was promoted
This list goes on and on an on and we have a number of staff dedicated to analysing various data. A decision to cancel is never easy as the last thing we want to do is disappoint our customers.
Kindest regards,
Julia