R330 for 3kg! excess luggage

I pack my baggage in accordance to IATA guidelines that airlines around the world adhere too! http://www.iata.org/whatwedo/ops-infra/baggage/Pages/check-bag.aspx

The IATA specified weight allowance for checked-in baggage is 23kg. Why then was I just ********** @R330 for a 23kg bag that is inline with IATA guidelines & why is Kulula not adhering to these internationally accepted guidelines? Even BA Comair that operates the airline implements 23kg as their norm for baggage weight.

Pure capitalistic opportunism that will be reported to the SACAA.