Think of a two-lane street and a five-lane highway. The bandwith would represent the lanes or space to accommodate the motorists. Then, the motorists and additional vehicles would represent the internet traffic. Now let's imagine that the two-lane road is congested at rush hour. The speed would logically be very slow. Now, picture the highway with the same amount of traffic. It would probably be less congested since there are more lanes or bandwidth to go around. It is similar in this case. Sure, 2000mbps may sound great, but with only 5 Gigs? On the other hand, 100 mbps is a standard connection guaranteed for double the amount or 10 Gigs.