I'm part of a small team using Dropbox right now and yeah, this was a killer. We're living inside the 2G free limit at the moment, waiting vaguely on expense approval. It's not even the amount, it's that it lives right between the "just do it" level (e.g. $30/mo on someone's credit card for EC2 hosting) and "management-visible priority" ($4k for development boards).

It's simultaneously too much for me to do on a whim and not enough for my superiors to care. Drop it to $35 and bill it monthly and we'd buy it in an instant.