It does sound like a cool idea to help bring some awareness to those who don't have some basic form of protection on there wireless
networks, it cant hurt to let your locals know that open are a bad thing. but as the others have said the average home user
is not going to understand whats going on. you could write up some very basic reports to explain the issues to them.
but this will also help you with your report writing skills because the report in a proper pen test is properly one of the most important
things you are providing the enduser.
but to be honest you would be better off setting up your own networks and pentesting them from out and inside
and the writeup your reports. because you wont really get much use out of cracking the hockey moms WiFi password, other than developing
your cracking skills or using tools like the pineapple. its a very grey area you are talking about but just be carful how you implement your
plans.