We focus on markets that primarily share word documents, PDFs, and powerpoints, rather than pirated movie sharing. Because these files tend to be small, the cost of storing them isn't as high.
We wanted to provide our customers with the greatest flexibility and peace of mind. We know that storage and sharing needs change over time. It's unrealistic to ask people to guess how much storage they will need.
Besides, storage is actually pretty cheap, and it's getting cheaper. We pass these savings onto you.