I think ATH multiplier loots r paid from auc fees and have nothing to do with ur normal return (just check all the nubz hitting uberz). And i also dont believe in "overall" lootpool, i believe in personal loot pool, if it wouldnt be the case, some ppl would just get 50% return all the time and some would get 200% overtime.
This year i turned 110k++ peds and atm im at 92% tt return (with some big loots: 4,5k 3,7k 1,7k 1k).
And miners almost always pays huge MU on amps (even if its 109%) while in hunting u put in mostly TT.