don't believe the missleading information on mmochampion front page about 1 item being buffed to 15k(with 0 evidence of anything other than that 1 item being buffed)
LOOK AT THIS SCREENSHOT
THIS IS YOUR REGULAR MORE COMMON(yet still very rare) ARTIFACT POWER ITEM that comes from battlegrounds, arena, world quests, dungeons, raids
it is NOT BUFFED!!!
i got another on my paladin on ptr
this screenshot is from version 21996 of 7.0.3
you get this 150 artifact power from maybe every 3-5 battlegrounds
that's not going to help when you start getting to 70-90% artifact talents completed
obviously blizzard can fix it but they could of buffed it when they buffed that MORE RARER 15k version BUT THEY DID NOT so it is easy to assume 150 is your common standard working as intended item