Routing: Johannesburg - Hong Kong - Los Angeles - New York - London - Cape Town

September 11th Security Fee 162.00 ZAR
South Africa Passenger Safety Charge 18.72 ZAR
UK Air Passenger Duty 3,089.00 ZAR
Hong Kong Air Passenger Departure Tax 223.00 ZAR
UK Passenger Service Charge 906.00 ZAR
UMSE 24.00 ZAR
U.S. International Transportation Tax - Departure 255.00 ZAR
International Arrival Transportation Tax (USA) 255.00 ZAR
Air Passenger Tax for South Africa 190.00 ZAR
U.S. Animal and Plant Inspection Service Fee 72.00 ZAR
Passenger Facility Charges 65.00 ZAR
Immigration and Naturalization Service Fee 101.00 ZAR
U.S. Customs Fee 79.00 ZAR
Airline Insurance Surcharge 6,102.00 ZAR
Multiple Carrier Surcharges/Fees 414.00 ZAR
Passenger Service Charge for South Africa 346.00 ZAR

Total Taxes and Carrier Surcharges/Fees: 12,301.72 ZAR
_________________________________________________
Johannesburg - Hong Kong - Los Angeles - New York - London - Doha - Paris
Doha - London - Cape Town

September 11th Security Fee 162.00 ZAR
South Africa Passenger Safety Charge 18.72 ZAR
Aviation Civile Tax 124.00 ZAR
French Airport Tax 199.00 ZAR
UK Air Passenger Duty 3,089.00 ZAR
Hong Kong Air Passenger Departure Tax 223.00 ZAR
French Airport Solidarity Tax 704.00 ZAR
PZSE 124.00 ZAR
QAAP 316.00 ZAR
Passenger Service Charge for France 455.00 ZAR
UK Passenger Service Charge 1,588.00 ZAR
UMSE 24.00 ZAR
U.S. International Transportation Tax - Departure255.00 ZAR
International Arrival Transportation Tax (USA) 255.00 ZAR
Air Passenger Tax for South Africa 190.00 ZAR
U.S. Animal and Plant Inspection Service Fee 72.00 ZAR
Passenger Facility Charges 65.00 ZAR
Immigration and Naturalization Service Fee 101.00 ZAR
U.S. Customs Fee 79.00 ZAR
Carrier Surcharge/Fee 5,756.00 ZAR
Airline Insurance Surcharge 6,102.00 ZAR
Multiple Carrier Surcharges/Fees 414.00 ZAR
Multiple Carrier Surcharges/Fees 116.00 ZAR
Passenger Service Charge for South Africa 346.00 ZAR

Total Taxes and Carrier Surcharges/Fees: 20,777.72 ZAR

Differences are bolded. Base fare stayed the same, 98K ZAR's AONE4.

20,778 - 12,302 = 8,476
French taxes 1,922
Extra LHR stop 682
Unknown Carrier surcharges 5,872
70% of increase due to additional carrier surcharges. Only extra flights were 4 QR flights in Europe, 2 on the A380. I did not minimize the use of LHR for this exercise.
Perhaps QR is not as surcharge friendly as we think.