While I agree with your point generally, I think it's unfair to say that Dropbox is conditioning users to think the only value proposition is disk space. For m

While I agree with your point generally, I think it's unfair to say that Dropbox is conditioning users to think the only value proposition is disk space. For me, the Dropbox client, web integration and storage features are streets ahead of the competition (at least, last time I checked). The free on-by-default document versioning is invaluable to me. It's just difficult to "condition your users" to value software features because by the time you're in a position to condition them to value anything, they already have access to 100% of your software features.