I see. So what you are saying is that Gumi is aware that hackers like us are hacking their game; and you are implying that they simply do not care about the insignificant things (i.e. imp farming or Elgif farming autowin)
However, I have one problem with your arguments in regards to Challenge Arena hacking. How come there are people with over 100k points daily that are still not banned? Mind you that this is on a consistent basis and they are totally hackers. I mean there was one time on the reddit when there was a player, who was level 72 and was nicknamed "Hack" that was topping the daily rankings on Challenge Arena. There are some people in my group that, every day, get over 100k points on a consistent basis: they haven't been banned yet.
Even myself, I sometimes forget to turn off god mode and instant BB on arena, but I still haven't been banned.
Hell, I have even "missed" one season of FH because of using 1 hit kill and Instant BB. Gumi decided to give me 0 points instead of banning me flat out.
My theory is that as long as you are p2p, like a heavy p2p, then you are immune to all bans from Gumi. I mean why would Gumi ban someone who is practically giving them income? Would you not agree?