if you put the best gear in a raid it hurts everyone who doesn't raid. the most you are currently going to get is your 5 ilvls on your weapon. maybe if you got enough people to back up the idea of screwing over everyone who doesn't raid to make it worth risking losing anyone from that game change you may get it eventually.
Then you need just, you know ... raid?

That's like definition of raiding - to have means to be better than anyone and to have unique loot. If "raid" doesn't satisfy those 2 conditions, then it has no meaning and no reasons to do (exactly what we have in FFXIV).