I've got grandma I see with multiple apps open and multiple browser windows, you walk in and they are doing nothing yet you watch the HD LED blinking on and off as the system is being forced to constantly write and then read off the page file.....and thank you, where you say large data sets, never really saw that from you till I started posting, and I generally always mention memory sensitive, large data sets, and often even get into video, photos (all to common to home users), and more so when you get into 'professional' type apps CAD/GIS/etc.....Also all the pofessionals I have as clients all do the same with their home system(s)....
Also need to look at market, (and even these forums which are primarily enthusiasts), if they go out and buy a K model CPU, how many do you think really want entry level - which is what 1600 is....the number of available sets of DRAM out there over and above 1600 is now almost 75% the number of sets in 1600 and growing rapidly, 6 months ago is about 42% over and to be honest if AMD wasn't in the mix I imagine it would be higher, AMD is effectively limited to 1866 in CPUs, (the APUs like faster DRAM).
I know nothing about you, if you are a builder/consultant or what, but in the event you are, I'm guessing our clienteles are far different, most all of mine have a fairly respectable level of PC knowledge and want to learn more, they ask introspective questions and generally understand what we are talking about, those that don't (for the most part) want to learn