At least you are sarcastic, I will give you that.
In all honesty, 10mbit/sec users may be the minority, but not as small a group as you try to make it out to be. First all, how many users are on 10mbit capable lines and dslams, but instead opt for a slower package because that is all their budgets allow them. There are more to the statistics than what you give it credit.
Now sure, I am 1 person on a 10Mbps line, had it in 2 different locations, but I also know others on 10Mbps lines, as well as having multiple of them at our office here in Cape Town, that is not even including the multiple 10Mbps lines we had at our previous office in Cape Town before moving.
They probably exist more in the CBDs of the 4 major cities, but they surely exist, in greater numbers than you would expect.
Keep in mind, Telkom will first roll it out where it makes financial sense to them, and the older equipment probably gets re-used in further remote locations where there is far less money for them as a company. I know that is what I would do if I had to make the choices.