Too much. And no clarity at all on what constitutes "fair use". This is a general problem with SAIX, however, because of the "per-gig" wholesale packages rather than reselling a complete "account" as IS does. Pooling would work on a SAIX level, but I can't see it being too successful at an ISP level.
It is difficult to give exact figures for fair-usage on a pooling system. However we have tried to base our packages on general fair usage (taking international norms into account too) and this would cover most users except for those on the extreme high-end that would require more than anyone could provide at a reasonable price.
We are all unfortunately hamstrung by the ridiculous wholesale system and prices of SAIX.
But we are at least trying to be more innovative and trying as best we can to meet the requirements of the market while being restricted by Telkom/SAIX.
At the moment I get about 100Gb a month. 80% is local. By mixing and matching several different account and splitting traffic between them. It costs about R1100, or R11/Gb. It would be great if an ISP could offer me one account that does all this without the shaping, throttling, top-ups and other garbage that goes with so-called "uncapped". I don't even mind paying per gig as long as every gig is not "assumed" to be international traffic.
We would love to be able to differentiate between local and international traffic and provide just one package. Unfortunately SAIX does not currently have the systems in place to do this.
Splitting local and international traffic as you do is the only option at this point in time. By mixing and matching packages on the IS and SAIX backbones (international and local) as you do you are able to cut down on costs quite a bit.
We can provide international and local-only SAIX packages (both with the same basic username and password but still two connections

) that provide similar but we would not be able to meet the price due to the wholesale costs on SAIX.
We, like you, are hoping for an improvement to wholesale ADSL prices in this country so that we can all get ADSL as it is meant to be!