Find an industry monopolized, disrupt it just enough to catch the attention of the incumbent, and exit.
I often think I should start an infant formula company and sell to Abbott.
Home users aren't going to buy that when they could get an inkjet for $50 (damn the costs later), and office users aren't going to buy it unless there's a service network and the lineup scales up to the 4 foot high office monstrosity multi function machines with collating and all that jazz. If they have printers at all.