There are MANY cases when two people in one house 'need' more than two tuners. At any given night during the week there are several shows on at once and multiple tuners are required to capture them all.
ABSOLUTELY! Perhaps the poster has not been properly brought into the DVR "fold." You get the blanket, I'll bring the kool-aid.
Sadly, with two ViP722 HD DVRs in the house, there have been occasions when there weren't enough tuners, or repeats discovered thru Search, and hard decisions have had to be made.