I suppose it could also help the 18-man PUGs who have trouble defeating some of the big bads. Only the popper loses weakening items, so each person in the 18-man PUG can take turns using 1 or 2 items to decrease the difficulty for all. For example, 18 rounds of Rex, 3 runs of 6 each, each person in the PUG pays 200k total for all 18 fights.

inb4 200k is big moniez....
Haha hard enough getting 18 people together for four runs, much less 18 runs. Although I guess if the items make it easy enough, lights auto-capped and procs reducing the NMs offensive power, you could do it as a shell with 12~14 people and not have to worry about filling the last few spots with /shout peoples. I've seen very few pure PUGs for rex, most involve a core group of 4~6 people who are organizing it and filling out the spots.