Loot Bonus And Shop Questions

Correct me if I'm wrong but loot bonus only works on mob drop quantitys not chests.
So wouldn't it be smarter to farm in a good location rather then a loot run if u have a good loot bonus build

All the shops look like they take a lot of effort but don't appear to sell that much so is a shop worth making
How do u do the drop down thingys

 

It works on chests, too.
It just slows down if you have tons of it.
And chests are still seen as equal or better.

And shops aren’t that neccessary, once the marketplace comes back up.

Edit: For spoilers:
There’s a tool that looks like a word document next to the film reel one. Click it.