Well let me let you in on a little secret....
If you have ever used a full pipe t1 thats wide open and not being used to a fast connection.
I have gotten SOLID upload speeds of 1500 KBps and solid download speeds of 1500 KBps... Not burst, we are talking about moving 20-30gb at a time.
T1's are guaranteed bandwidth, cables and dsl's are for burst, which is why they are faster then browsing the internet. But solid state throughput is much less.
My cable modem bursts over 30mbit, but I rarely ever see over 600-800 KBps on a good day.
Cable and DSL has a faster ability at its heart, but is pretty much always bottlenecked, or as you can set if you have ever played with a T router, you can set a burst limit and a nominal limit, its very common practice for isp's so their lines don't get flooded.
If you think about it, I live in an apartment building with over 300 apartments, if 1/2 of those have a cable modem which is highly likely to be higher, thats 150 apartments rated at 8mbit, so we have a 1200mbit connection to this apartment alone?
The main trunk lines running through the country are not big enough to consider handling the "city" I live in at those rates, let alone the country.
This is why I love T1's and so on, let alone you can strap them together. They are massively expensive for what you get unless you need them for business though, there is no doubt about that. But in practice when you are download and uploading they are much faster as a general whole.
Glad to hear you router is working well for you