In the last week alone our instance has moved nearly half a terabyte of traffic per day.
When I first setup this instance I was stably housed and had an awesome internet connection so the primary costs were power and admin time. At that time it only cost about $50/mo to host.
However since that time life circumstances have made me housing insecure and forced our instance to be run in the cloud, increasing our costs to $150 - $200 / mo