I like the premise of "dead simple" file sharing, but it seems to me that the minute you start charging for the service, the "dead simple" moniker goes away (my wife, for example, would rather grab the nearest nerd than pull out a credit card to sign up for a file sharing service).

I ask because I don't see any way forward other than charging for space after a certain point, since you actively advertise no size limits. What am I missing?