One particular action won't demand that kind of speed, that's sure. However, think of scenarios, where there's multiple users down- and uploading stuff. For example, you and your family are watching tv via iptv provider (multiple tv sets in the house, each streaming HD video), at the same time you might have bittorrent server somewhere in the basement and numerous mobile devices (tablets, phones). The demand can break 50Mbps for one technically advanced family.

Now, if you think of businesses, then the demand for data throughput might be 10x greater or more. Depends on the type of the business and number of users (users also being servers).