No they are farming as soon as their computer is on, and some people are lazy and will just buy safecoin "storage on the network"
Never heared about dropbox
And for some apps the dev. can pay for the storage even, cause a datasever is way more expensive than maidsafe will be.
Plus privacy cost money, you can use the normal internet store your data on a server thats beeing hacked constantly , Yahoo, Sony, Visa etc.