Is upping difficulty worth it?.. even if i cant guarantee a win?.. right now i just auto fight standard fights.. dont have to pay attention, always win and get pretty decent loot...

Ive Expert regularly b4.. during the 1st 2 advents and i did get more loot per run.. but sometimes i got very little aswell.. i dont know if the 50% more AP spent = 50% more/better loot.. and likewise.. if the new ultimate difficulty is worth 100% more ap... for the chance that you might loose every now and then?.. even when i fight manually...