Hey, I'm writing from the point of view of a warrior. I remember when I was leveling in the 30-55 zone, there would often be level 70s taking anything and everything. This was especially true of Guk and CoM. It kills the thrill of leveling in these zones when Sir Pwnzor suddenly goes around obliterating everything in a second and leaving the zone empty. As a level 30-55 you then you have to wait for the respawn and hope you can get a few kills before Pwnie McPwnPwn goes around for another sweep.
I didn't understand why these 70s did this at the time, but I do now that I'm 70. As a low-tier warrior the first thing I do when I get a new piece of equipment is outfit it with a stone of sturdiness - otherwise, my new equipment is usually inferior to my old equipment. The problem is getting a stone of sturdiness involves slaughtering hundreds of green con mobs.
It's really no fun to go to these lower level zones and farm for hours so I can use my equipment, it's joyless and feels like a job for a trained monkey - nor is it fun for the lower levels whose spawns are being massacred by 70s.
I think if you increased the drop rate of these augmentations to be more in line with some of the quest item drops (that noble's brooch is everywhere...), the game would be more enjoyable for everybody. You would spare higher levels hours of joyless grinding and lower levels could properly play the zones that were designed for them.