The internet doesn't work the way you're thinking it does. Think of it this way: You have multiple options to drive from PA to AZ. You could take I-40 W, I-40 W and I-80 W, or simply I-80 W. I-40 W may be congested/have heavy traffic around half way, just after the I-80 W exit. I-80 W may have traffic up until the I-40 W comes onto I-80 W. Optimally, you'd take I-40 W, then take I-80 W to avoid congestion/traffic.
With the internet, there are numerous carriers: Level3, Cogent, Savvis, CenturyLink, Hurricane Electric, Time Warner Telecom (NOT Time Warner Cable), Time Warner Cable, Google... the list goes on. They're basically the highways of the internet. Just because you have great connectivity doesn't mean somewhere else does. It doesn't necessarily mean you have a "higher quality" package, in fact, Comcast chooses to use lower quality "highways" (routes) because it's cheaper for them.