I'm a bit of a klepto when it comes to games like this, in FO3/Skyrim etc. I generally pick up everything that isn't nailed down for selling later.
Is it worth doing that for this game? Only just started, and wondering whether I pick up all the shells on the beach for selling.
Also, if I decide to avoid collecting all the junk, is there anything I should be picking that may appear to be junk but actually isn't, or is worth something? e.g. In Fallout 3 there were vendors that paid handsomely for things like old cameras, pre-war books etc. Stuff that looks like junk, basically.