Niel: XNet do not advertise their internet services, and they have some kind of arrangement with Telecom for VFX. I would suggest they provide internet access as an add-on to VFX rather than VFX as an add-on to internet. In other words they need their own internet connection to run VFX and so they also let customers make use of it.
The above sounds a bit confusing, I know, it is Friday... But basically I don't think they need to make lots of money out of data usage, because I don't think internet access is their core business. Makes sense, because after all they've run toll services over VoIP long before launching VFX (correct me if I'm wrong) and they make "cold calls" only for tolls services (and now e-mails to customers to upgrade to Fusion, i.e. voice services). So they are probably the only ISP that would do pay-per-Meg and not data blocks.
Just my 2c.
My thoughts exactly WXC needs a good connection for their VOIP services so setup an ISP as it made sense but its not their primary market just a means to an end.
VFX/DVX is still as good as the day they released it. If your not happy with XNET speed's then move to an ISP who peers at the APE and you will have little problem running your VFX as before the only difference now is you voice traffic will count as usage.