I am not sure my computer can even sustain that kind of data rate.

I have already hosted some low-traffic websites off small-office data plans an can tell it mostly works. Uptime is not that good and you'll spend some time on the phone explaining it's their connection and not your server that's down. In the end, it's not really worth it.

As for effective bandwidth, what most telcos sell is the connection speed to their first router. Your mileage may vary.