So I was bored and decided to do a few calculations.
If you owned a cable such as the SAT-3 and resold 1mbps (mega bits per second) for R2000/month (1-1). That would mean at full capacity:
R2000*(120 * 1024) = R245760000/month
245760000/5.97 = $41165829/month
639 000 000 / 41 165 829 = 15
So if you only had to pay for the cable, didn't have to pay for repairs, staff etc, then it would take you 15 months to cover your cost.
Values used:
120 = Maximum capacity of the cable after all upgrades
1024 = 1024 Mbps in 1 Gbps
5.97 = Current rand/dollar exchange rate accoring to nedbank.co.za
Of course this calculation has no meaning because:
1. The original capacity was only 20Gbps. It most likely cost them more to upgrade it.
2. Ultimate capacity is 120Gbps but when? 2030?
3. Connection fees to other networks?
4. Repair costs?
5. The cable is running at 100%
Still makes you wonder how they justify their current costs. Whats the cost of 1mbps 1-1 on SAT-3 these days? Last I checked it was in the region of R16000 for 1mbps 40-1 (with that, I get 1.8 months

)