Your point stands, but let me point out that when gmail started their "9GB free" thing way back when, that was an unfathomable amount of storage for some of us. And gmail's not the only service that's offered huge amounts of free storage over the years. So yeah, I think it's probable that a bunch of us have been primed to expect free storage.
edit: Also given how cheap cloud storage is from ie MS Azure...
Depending on storage type you pay $10-$18/mo once you're using a full TB. If you use less, you pay proportionally less. Dropbox's 2TB for $10 is a comparatively better deal if you use it all, but if you use 1TB or less it's not. Which, now that I'm looking at it, probably means their business model is counting on a lot of underutilized storage caps from their subscribers.
Nay i demand a decent minimum amount of free online storage. These jackasses have taken away SD cards from mobile for a reason. They overcharge a memory upgrade on laptops tablets and mobile phones on purpose. They choke companies into ditching local servers and moving to the cloud. Why? sUBsCriPtIOn BaSEd CLoud stORAgE. Shove it Microsoft Google and Amazon.