I actually thought dumpster diving was disgusting til watching a documentary. The documentary is about "urban foragers" they throw out so much PACKAGED food that is still good it is incredible. So these people would go through dumpsters filled with packaged foods and take whatever is good out. Then when you find out that perfectly good clothing and other items are also thrown out then it makes it more understandable. I have still never done it but I considered it.
I've never scavenged thrown away items for food but have scored some wonderful things like lumber, wicker swings, new counter tops, cabinets, baskets, chairs...the list goes on and on. I've scored even more and greater items through doing property clean ups, word of mouth needs, auctions, yard sales, Good Will, and flea markets.
I've scored 480 lbs of red turkey wheat for making bread, an electric wheat grinder, dozens and dozens of canning jars, canner and all the equipment, etc. just on a word of mouth on just one garage and basement clean out~for FREE.
I've scored a cheap and malnourished milk cow and sold her two months later, looking like a new penny, for a $500 profit. I've got countless stories over the years of good scores and profits turned or items repurposed into useful items for around the homestead.
I scored 19 free roosters just this year to process and can into a jar. I've been eating the best chicken soup this winter from all that free meat.