Sean, I don't believe your comment there is fair or true for that matter. I've seen so many literally brag about their success in keeping SPS with tap water and no skimmers, but the fact is, "old tank syndrome" sets in signifigantly faster in these systems AT THE HOBBYIST LEVEL than with those using RO/DI, skimming. You are with your tank all day and can test and adjust. Most of us here have jobs that pull us away from fish tanks. You may be giving some the impression that they have a few spare hours a day and will be able to maintain such a tank.
Also, you and I have stated numerous times on this site that it is more cost effective to spend the money on equipment now than it is to spend more later down the road on necessary equipment and replacing live stock. Stand by the equipment you sell and advise we buy and use it on your tanks.
While everyone in this hobby is very quick to boast success, there is much more reluctance to open up and admit failure. Most of these low tech tap systems seem to disappear into the pages while those with proper set ups seem to last and last in the tank threads. We all know of someone who mentions success with tap water, but where are the threads when the tank crashed?