He connects those dots together. "Wait, hold on - you're building all that yourself because you don't want to ask the crystal for shit? Is it because you don't think it's a fair exchange to give it energy or whatever, or you don't want to give it?"

The words might sound somewhat judgmental, but Levi's just trying to understand what the line is for her here.

"Anyway, I don't mind doing this for you once in a while, if we can work out an exchange." For his purposes, he doesn't really need one, except that if Ari hopes to have him visit again, it'll make Levi more comfortable to spend time in a place not covered in a layer of dust. "If it's too much for one person, you can ask for help."