It's all relative, I make more than some and less than others. This tank is cheap compared to many of the systems on ReefCentral.
Amen to that. At the end of the day anyone with any money to spend on an aquarium regardless of size is obviously doing better than a big chunk of the population, and no matter how big or hi-tech or expensive your build seems there are always people who take it that step further...
Compare the cost of a build like this spread out over the life of the tank to a season of amateur motorsport (or any petrol-powered hobby), or a ski/snowboard kit and lift-passes and all the associated costs, or a good set of golf clubs and a couple of years membership at a good club, etc etc. It may be at the upper end in terms of cost for an aquarium, but even at this level it isn't an exceptionally expensive hobby in the greater scheme of things IMO.