I personally don't. I realize you may struggle to understand that, but as I've admitted before, I don't Raid. I'm 99.99% certain I'll never so much as attempt the Ultimate fights, so I'll never have these items. In fact, I don't even do Savage Raids. My iLevel average on my WHM is i360, and I'm quite content with that. So, clearly, this cannot possibly be about exclusivity.
I do, however, prize a sense of fairness in the game world. I want rewards structured around in-game effort and skill, not outside forces like how much money is in your bank account. For people who use the PF, I imagine there's also a desire for a system that isn't cluttered with thinly-veiled RMT runs so that they can use it more effectively. Just because something doesn't impact you or you can't see how it impacts others, doesn't mean others are lying or making things up, and it's quite judgmental and arrogant to assume otherwise.
That's always the reality, but we can moderate this with relatively minimal effort if SE adjusts their ToS. All they have to do to significantly curb this type of run is close the giant gaping loophole of permitting run-selling when Gil is exchanged, along with maybe a ban on posting references to non-XIV sites or content within the PF description. Boom. Anything reported is a clear-cut, binary sort of judgment that a GM can make in just a few seconds.
Alternately, they could legalize RMT in this particular context, and include PF options for sold runs so that people can filter out the runs they aren't interested in. I think this would be a mistake (see Diablo 3 for a recent attempt at legitimizing RMT), but that's SE's call. What they really shouldn't do is leave the policy in an unenforceable state. They've left the door wide open for barely-hidden RMT, despite officially banning it. Either open the door up officially, or close it more firmly. It's that simple.