Ladykiki said:
If you think about it, how BSTs level, is to chuck a DC/EM pet to a T/VT and potentially IT, think how just damaging one pet is to a T/VT prey. Reverse the situation (where you control the VT/IT pet and hunt EM prey) and it's why I cannot see where the EXP spike will come from. Maybe an additional 2000~ to whatever EXP/hour you can make, but I can't think of any other camp except Bohyada Treee for T and onwards charming then EM raping.
Well, asides the fact that T+ pets will still effect XP since XP is based on the highest-level mob...
Crawlers Nest: Helm Beetle, Crawler Hunter or Knight Crawler vs Killer Mushroom, Death Jacket, Doom Scorpion, Worker Crawler
Attohwa Chasm: Cutluss Scopion, Cave Antlion, Monarch Ogrefly, Tracker Antlion vs Tier 3 Goblins, Tracer Antlion, Attohwa Couerl(?), etc...
Bostanieux: Bloodsucker vs Werebat / Funnel Bats
Gustav: Antares, Robber Crab vs Tier 4 goblins, Hellbat, Makara, Labyrinth Leech
While most of those would easily 1-shot you if you mischarmed, it's not exactly hard to get help to sleep the mob and toss charm a dozen or so times til it lands. And using any of those pets vs listed mobs could pretty much (1-3)-shot the latter mobs, it'd be nonstop chains and completely broken.
Luckily, this isn't gonna happen though. =P
...I hope.