I'm ALL for rare/ex NM drops. First off, 99% of the time, these mobs are camped for no other reason than to sell their drop for massive change, rather than actually use them. And the people who actually USE them more than likely camped something else to afford it at the AH in the firsplace.
Person A camps NM1 and gets Drop X and sells it.
Person B camps NM2 and gets Drop Y and sells it.
Person A can now afford Drop Y, since Drop X sold
Person B can now afford Drop X, since Drop Y sold.
More or less that's how this system works.
So why not simplify the system by having these drops EX? If person A wants Y, well he'll just have to camp NM2 if he wants it, and not camp NM1 however many time's it'd take to afford it.
And because most people just camp NM for gil, these items would become much easier to come by. Of course this leads to problems with NM drops for crafting. Suck it up. Camp it you lazy ***.
The only real problem with the system is no longer having access to large amounts of gil quickly anymore. Well, the system is already messed up as is, so basically you're trading one problem for another. However, I think this system would work as a whole: If you were able to camp NM's for an item you want with little competition, then why would you need such a huge amout of gil in the first place?
I'm for this idea, thumbs up ^^