Im gonna say no. It would just be gamed, people go out, clear POI, knock out back wall, wait for night, go loot everything.
Gotta be careful about things like that, people will always game things and you dont WANT people to play in awkward but optimal ways. Having crap loot for 18 hrs and good loot for 6 would feel silly. I also think hiding things behind pictures is a bad idea, it just means everytime i explore somewhere i destroy every picture to find loot. Or with getting skill points for crafting, it makes sense but making a thousand stone axes to level up tools was bad gameplay.
Not every risk needs a reward, not everything is meant to be an intentional challenge. It would be like higher loot for being hungry.
Some things just drive decision making, for example having the runs makes you look for goldenrod, broken leg makes you prioritize wood, glue and cloth.
Night time is meant to be a time to go crafting and add a break to constant looting, if you cant handle the risk you dont get the loot. Thats enough. AS