For a long time it’s stated the it’s the average of your main + hireling /2
So you needed Max Gold find, Max Luck, Max Item drop on both your characters
All Farming sets only works on your main,
I follow this rule.
Then It got a bit confusing on this topic as I can’t exactly say that the average number follows the cap rule.
That you can exceed the capped on your main so that you don’t need any luck, gold find, item drop on your hireling.
I’ll ask on the DQ Q and A to be sure.