Some random dude got to play 2 days a week.
Somehow gets 50ex drop.
Lists for 50ex.
No sell whole weekend.
Comes online next weekend and gets messaged a lot about it.
Relists it for 100ex.
Because of slow API price didn't got updated yet.
Looks at multiple "yOU ARe A PRiCeFixEr! rePoRTinG YoU!!!1"
Turns DND on for the rest of the weekend.
Price jumps further.
GOTO 50

An example of small part of your example that will be victim of such report system.
I'm not telling that it's a most likely scenario, but it's definitely a valid one.
But you probably don't care enough about consequences, as long as OTHER people affected and not you, do you?