Because they didn't have 50% of their users trying to view 6 mbit/s video streams.
EDIT: Just wanted to clarify that 50% is a number I pulled out of my ass. The general point is that the percentage of users who stream video online on a regular basis is increasing more quickly than the economics/logistics allow the ISPs to perform network upgrades.
> The general point is that the percentage of users who stream video online on a regular basis is increasing more quickly than the economics/logistics allow the ISPs to perform network upgrades.
This is another citation needed point. Bandwidth consumption has always increased over time, as has the performance per dollar of routing equipment.
EDIT: Just wanted to clarify that 50% is a number I pulled out of my ass. The general point is that the percentage of users who stream video online on a regular basis is increasing more quickly than the economics/logistics allow the ISPs to perform network upgrades.