Because the time and repair bill? Not many people can spend many many hours on this and pay tons of repair bill.
What makes no sense? Other HM all drop stuff that can give upgrade to most of the people. Why didn' HM EC drops 1 campaign+many Rakata or HM TFB drops 1 dreadguard+ many campaign? LI HM is the only exception.
Holu hell, you don't want to understand that this FP is made to be done in Tionese (someone did it in a 2-man group ...). You don't even understand that Lorrick drops the Rakata chest and the Columi MH (check who drops them ....).