If you underestimate your bandwidth requirement (e.g. you expect 1,000 viewers but there are actually 1,500), your streaming video does not just suddenly stop in the middle of your event! Most providers will simply bill you for any excess bandwidth used beyond your contracted amount.

One way to look at cost:  With gasoline at $3 per gallon and using a car that gets 20 miles per gallon, it costs about $0.15 per mile to drive your car.  Streaming video bandwidth costs less and is much more rapid, efficient, convenient, and green!