Can I clarify? - being a "cloudbased" storage cabinet, is not what makes it "unlimited".

Intuit's choice - to allow this feature to be unlimited is the reason it is unlimited.

ALSO, It Matters if:

(a) If your sharing and/or uploading a document via the "Shared Docs" feature - it is "Unlimited" Storage. -BUT-

(b) If your sharing and/or attaching a document via the "Client Request" feature - there is a "Document File" size limit of 30MB.

So, while you can have unlimited number of docs, each doc seems to be limted by "30MB" file size.