Would be quite amazing if they are not profitable. After all they seem to be quite conservative on the product development side and have always had courage to charge actual money for their service.
One thing I've always wondered is what is their actual cost structure. Based on my own usage I would assume the actual storage part is quite small compared to the data processing and bandwidth. Since the sync works so smoothly, it is convenient to keep all kinds of projects there. Thinking for example node.js projects, which take not so many megabytes, but may contain 10-100k small files (due to dependencies).
One thing I've always wondered is what is their actual cost structure. Based on my own usage I would assume the actual storage part is quite small compared to the data processing and bandwidth. Since the sync works so smoothly, it is convenient to keep all kinds of projects there. Thinking for example node.js projects, which take not so many megabytes, but may contain 10-100k small files (due to dependencies).