Unfortunately your friends will eventually realize:
- They are probably going to pay more for their "easy to use system" with crappy cameras
- They are going to get less video quality for the same $$ you spend
- They are going to create a security nightmare for themselves by playing around in that space (PTP, UPnP, unknown servers and unknown companies) while lacking any technical understanding of how "unknown companies" security/update protocols might affect them
- and potentially end up with their cameras just being part of a botnet (like bp2008 comic illustrates) or exposed via search or vulnerability to anyone interested on the internet
but
fortunately, they probably won't know what a botnet is or how many people might be watching their video feeds (creepy!), and in this case ignorance will be bliss!