Inside information- some people in SA make insane profits on STBs. I know who they are but if I mention it here I will have people knocking on my door.
Multichoice makes a lot of money, as does a few well-connected individuals.
This is an old sport, they always come with an "upgrade required" thing whenever a new decoder comes out. They are pushing sales of the Explora harder than they did the previous one, because they want to render the previous one obsolete soon. The ads are in your flippen face all the time. I have seen this happen numerous times but not so severely as now. They are making a substantial profit on the Explora, because its locally manufactured. The previous PVR (which I have) is made for DSTV by Pace, which is a UK company.
The Explora is a minor upgrade to the previous model, they've basically just made the menus better (but still nowhere near as good as it can be- not surprised given the TOTAL LACK of embedded talent in SA) and it has a massive hard disk. From the one I have played with, not much to write home about.