That's the issue.
I did buy twhl.co.za a while ago to try out the host's 'pointers' system, but it turned out to be crap - if you typed twhl.co.za/?start=0 or something, it would take you to cariad.co.za/twhl/?, which I thought was pretty damn funny.
And to support another TLD I'd have to buy a second hosting package, and that's a bit tricky, with us living under a bridge and all...
BTW, .co.za's are a mere R50/yr ($7 / ?4). .nets are $25 or more...