This isn't him trying to make things difficult for Qu Jianlei; it's just the way things are in the Wasteland. Respect for knowledge here isn't heartfelt.
They do want to respect knowledge, but half a day, tapping a stick here and there... is that worth six hundred silver coins?
Qu Jianlei looked at him speechlessly, "What's the most valuable thing in the Wasteland?"
"What is it..." Geng Shougong was a bit confused, "A strong adventurer?"
That's actually true, the Wasteland values the strong.
Qu Jianlei slapped his forehead, expressing helplessly, "The most valuable thing is talent!"
"That's true," Geng Shougong nodded, "But this is... a bit too valuable, isn't it?"
"You don't understand what kind of talent it is," Qu Jianlei didn't want to say more, "If you're worried, you can test and repair first!"
Then he turned and walked out, "Send the remaining payment to me... If you think it's not worth it, that's up to you."