Unfortunately thanks to Netflix and Amazon, I'm barely staying within my usage cap with Comcast as it is.
What the hell are you downloading? Raw uncompressed blu-ray images? According to Netflix's usage page, the highest quality streams use HD: 3 GB per hour, 3D: 4.7 GB per hour, Ultra HD 4K: 7 GB per hour.
For a HD stream, it would take you over 80 hours to reach 250GB. 40, 2hr HD movies. Wow. Just Wow. The average American watches 2.8hrs of TV per day. If you download 100% of only HD content from Amazon/Netflix every month you'll be about at the 80+hrs / month of usage. Still a lot of downloading, given that you can't watch live events (sports/news broadcasts). Btw, even the World Cup isn't broadcast in 1080p like on broadcast/cable TV.
The current caps are from 250GB to 350GB depending on your service area. In fact, if you look at your data usage, you'll notice that they've suspended the 250GB cap enforcement.
You do realize that you fall into the .000001% of consumers who should be on a business plan if they want to download 50TB/month.
Remember no business caters to the .0000001% of consumers regardless of their business. You should vote with your dollars, find a provider that will give you unlimited usage with higher bandwidth. I'm sure there's plenty of ISPs that would be willing to drop an OC48 (2.4Gb) into your house for a quite a few grand a month. Or a Comcast business solution that has no cap.
Surely a 150Mbdown 20Mb up with no caps for $250/month is enough for you and your entire family to watch HDs every minute of every day until your eyeballs rot. Just think, with 150Mb/s down you could consume about 65GB/hr, or 20 HD movies per hour 24hrs per day, 7 days per week...
Right tool for the right job. Obviously you want Commercial Services at Residential Pricing and you don't meet the requirements of the typical Residential user, so switch to Commercial Services and be happy.