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This is merely an option for already proficient water cooling users to get cooler water temps with greater heat capacity compared to normal radiator based cooling.
Laymen don't overclock and they cetainly don't water cool, laymen buy Dell's
as for upkeep, I've been using this for over 2 years now
with normal tap water, any and all buildup occurs in the evap res, I get
no buildup in the water block/tubing (I strongly recomend sticking to a single metal type though, either all copper/brass or all alluminium), mantainence is simply a full drain every 2 months or so along with rinsing out the in-line filter, takes like 10-15min.