They do tend to find a lot of stuff, especially if I get them to do it repeatedly. One household found 6 bikes in a couple of days. Another sim found two fridges and a jukebox in one scavenging hunt. And they also find lots of furniture that is burnt and needs to be fixed before it can be sold. But things that are in good condition and can be sold right away can bring a lot of money especially if sold directly from inventory where they are listed with the original price. I think the most expensive haul was fridges and jukebox, each had a initial price of 2000, which was reduced to 1000 once I placed them on the lot. My sims built two extra rooms with the money.