Home LANs are the trojan horse.
Jef Raskin: “If you have to set up a network it's likely to drive you crazy.” Amen. Too many people forget this fact. [Scott Mace's Radio Weblog]
That's Scott Mac referencing an interview by one of the godheads of our industry: Jeff Raskin. He's pointing out that despite best efforts and sexy consumer WiFi – the practical realities and setting up and maintaining networks, especially Home LANs – is a nightmare.
So now think about it. What if your software WAS the Home LAN installation code and left behind [insert whatever it is you're hussling?] Ooops, I just revealed part of our business plan. 
[Marc's Voice]