Have a different perspective.
Once your ilvl is above 800, it's irrelevant for 95% of things. Broken Shore is free 850+ items for all 110s, add in honor talents and the average player isn't going to be able to be killed in wPvP. This will only get worse as the expansion goes on.
If you are already killing the majority of mobs in 2 globals for farming for skinning or whatever you probably spend more times waiting for respawns then anything else, 15% more dps really doesn't really amount to much.
The relics would amount to at most what, half a percent in iPvP.
If you think it will speed up farming NL, that means you aren't hitting the instance cap, so it can help there, but the bigger issue is going to be NL fatigue from doing it so much and not the speed you do it imo. And if you are doing it right you should be able to hit the instance cap at ilvl 800 easy since you can skip everything to rockmora, and you can skip everything but the last few mobs before the worm boss, and even then if you have leech you can ignore them and just kill the boss.
So from my perspective, I would like the relics, but they would only help me in duels with other 101s. Because people leveling 102-109 are pointless. 110s are quickly out of reach and this wont help. The expansion has a lot of life left in it and I'm enjoying the artifact grind as a long term goal personally. Sooner or later I'll get the lockbox that has it myself, or I'll see one cheap. No way would I ever pay more then 50k though unless I got a windfall of gold and it was burning a hole in my pocket.
So yea, I view the prices as an absurd personally, because 15% more dps doesn't really help me do anything I can't already do as an ilvl 810 shaman.