Rogers only blocks PPTP VPN connections. Also it's not a VPN "fee" exactly, it's an entirely different APN. If your device doesn't allow you to manually edit the APN, you have no hope of getting your Rogers device to create a PPTP VPN connection over 3G because you cant access the internet.vpn.com APN.

However, L2TP and IPSec VPN connections work just fine over 3G on Rogers, no fees or APN changes required. So I'm not positive that NAT is the issue if I can establish the other types of VPN connections although this is hardly my area of expertise.

So a home network will be NAT'ed twice. How nice, we almost got things sort of working with one NAT, now the Internet breaks again.

and that's extremely profitable for them. Why would they switch to a format that doesn't give them the easy out to gouge customers?

Profitable? I guess, but it doesn't make them much or any revenue since i'm pretty sure 99% of their mobile customers don't really care.