Welcome to the rest of the world. When I first got cable internet in 2003, the cap was 60gb/mo. Skip ahead 8 years, the cap is now 60gb/mo. Wow, progress. We pay about $50 for that too. My cable company only gives up to 125gb, if you fork over $100 each month. It's pretty disgusting that service hasn't kept up with technology. Back when my hard drive was only 40gb, that sixty seemed massive and unreachable. Now Steam, Youtube, even just my daily post-work f--- around eats up a lot of bandwidth.
Tin foil hat time. I think the caps exist because unlimited internet renders the cable company's other services obsolete. If you've got your Hulu, Netflix and Skype, then you don't need to buy television, premium movies, pay-per-view, and phone service.