about 5 years ago, I was living in NC and was using road runner cable. Up until june of that year, I had always heard road runner as one of the internet providers to use if you wanted to do a lot of downloading as they had better speeds than DSL and didn't have any limits. At the begining of July, I got a letter from them saying that I was was using too much bandwidth on my 5mb down/512kb up cable connection. How much was I using? In 3 months, about 80gb a month. I was helping distro for anime fansubs.
When they sent the letter, they decided that people in NC only needed 20gb a month (yes, they actually stated it). For some people this was plenty, like all the rednecks who just surfed pron sites and checked their email. I was one of the few geeks in the area and was downloading fansubbed anime everyday and getting into linux, so I was downloading all the favorite flavors of linux, not to mention all the betas I was downloading. When I talked with roadrunner, they had 3 options for me. Use less than 20gb a month (for me and 2 other family members), upgrade to their premium connection which was $80 a month (as opposed to the $35 I was paying) to get a 8mb down/1mb up and 60gb limit, or switch to business class which started at $120 a month.
Since I was still in college at the time and had no job and living with my parents, I had no option but to limit my bandwidth since we didn't have DSL as a option, and dialup was also not going to happen. 3 months after I got the letter, they changed their ToS to up the limit to 60gb a month, and after new years they removed the "limit" completely replacing it with "abusers will be dropped".