Openweb charges R1369 for 512k uncapped. One can almost justify spending that kind of money each month, but R2632 for 1024k uncapped is hard to justify.
At +-50KB/s one could theoretically download 130Gb/Month on the 512k.
Why can't Openweb come up with a product for 1024k connections that hard caps international at say 100Gb? They could tack on 30Gb local and Openbrowse and charge a simlar price to 512k uncapped.
Alternatively, on the 512k, you can probably download a maximum of 5Gb per day. So how about a 1024k product that is capped at 5Gb per day. This has the benefit of spreading usage evenly over the month, with a use-it or lose-it kicker for the ISP.
I'm pretty sure that a high volume, pseudo-uncapped product for 1024k that is priced similarly to 512k uncapped product would be very popular indeed.