I understand where you are coming from. But this analogy is more like "I provide free support for a year, then find I cannot cover my overheads, indeed I cannot even afford to eat!"
The infrastructure and bandwidth that IS has to buy to keep pace with an ever growing number of users trying to use "unlimited" local bandwidth is probably beginning to take a big toll on their bottom line. Look at what Verizon are doing - 2c a MB local wholesale - thats a grand for 50GB, as they try to cover their costs.
There is no free ride in SA on data lines. And Telkom screw IS just as they screw us all.