There is no such thing as unlimited. Can you get unlimited electricity? How about gas? Same thing applies to Internet bandwidth, disk space, memory and CPU. These are all finite resources. Instead of allowing a free for all, or allocating a huge amount up front but then charging 100x as much for the next MB of bandwidth, we instead use a different model. We allocate enough bandwidth and storage space to meet the needs of most sites. If you need more than the included amount we charge a reasonable and fair price for each additional GB of bandwidth or storage space.