I think your prices are too low for these packages. Many customers don't need that much bandwidth anyway and it might look too good to be true in some eyes. It also might attract customers who are (as always) just looking for the cheapest deal out there. They still expect top noth support and will leave you in a heartbeat if they find an even better deal. I'd bump up your prices by at least 30% and reduce the packages by 10-20% at the same time. Then provide world class support and customers will love you.

Chris