Was offered $80 for whole box. Is it a good deal?

Recently I’ve been going through my Lego sets and selling them so I can make space and have funds for new projects. Right now I’m selling architect Big Ben 21013, ambush on ferrix 75338, Hoth at st 75322, and the millennium falcon 75257 all have all pieces and minifigures I was offered $80- $90 for the whole thing. I’ve looked it up and mostly of these sets are worth $45 with the millennium falcon worth at least $100. Now I’m not an expert with the Lego economy but I do know the value items...