Ah yes indeed, demurrage, but Farnborough comes but once every 2 years.....and only last 5 days.
Having an aircraft sitting on static once in a while is hardly a long term business plan.... or a sign of "doing something right" as was previously stated.... more a sign of..."this was negotiated as part of the aircraft purchase agreement....take what you can get....it wont need us to crew it...and its easier than selling charter....."
most other charter operators are out flying this time of year...its the conventional way of making money out of a charter operation......