Did you know that your Comcast's bandwidth is capped at 250GB per month? In the old days, most Internet packages were "all you can eat" (unlimited) bandwidth.
Now because of technologies like Netflix streaming and Bittorrent, ISP's (Internet Service Providers) feel that they have to cap the bandwidth to prevent a small segment of their user population (generally around 2%) from using excessive amounts of data.
I have to admit the answer to this question of removing Comcast's bandwidth cap is under whelming, but if you use a lot bandwidth and you need another option. Then for a few dollars more then Comcast's regular Internet package (which is currently starting about $45 per month, not including taxes and equipment rental) you can order the Comcast's Starter Business Class package (which is currently starting about $60 per month, not including taxes and equipment rental).
Comcast's Starter Business Class package offers unlimited bandwidth with no caps, plus it includes a few extra perks that may or may not be useful to you.