1-15 is very unbalanced nowadays and this is a fact. Anyway how many people have more than 8 enchant? Don't u think there are more people with less than 8 enchant than people with more?
So with their uber equipment in your scenario they will have less chance to have a good amount of kill than anyone with a npc equipment... Do you really think this is fair?
They can always get another equipment and go to the "low lv enchant" zone, but the equipment they spent so many money to get become suddenly useless. A  sword will have an higher value than a  sword.
I'm not against a limit in pvp zone, but I also think that Aeria cannot give a kick to who spent a lot on their gear. It is unfair (other than an action against business) at this point.
I think it is a good idea (like they are doing) to limit the lv of GM enchant.
I think it is useless to sustain a simil petition that won't happen in any case, but we have to sustain more plausible actions.
Example: the next GM enchant limitation is to 13. In the October promo shcedule
a lot of people are asking to increase that limit, let's GM hear our voice too and ask to decrease (or at least not increase) that limit, at least for 1-15 items.