I have absolutely no problem with this. Don't knock it simply because *you* don't see immediate value in it. Way better than throwing shit into the landfill. Re-using is the best form of recycling.
I've gotten rid of a lot of stuff on Craigslist Free / Freecycle and gotten some things here and there like a perfectly fine computer chair. Saved me some cash and saved a lot of random plastics, metals, paints, etc from being dumped in a landfill. Can't ask for anything more.
Piles of wood? If I had a fireplace or a firepit that I always cooked on I would definitely check them out. Hey, thanks for the head's up. Don't let good raw material go to waste. Firewood can get expensive considering you're literally just burning it. It has no re-use value. And chopping/cutting it can be a pain in the ass. Even free trees to cut down. Uh, might as well. It's not like I'm going to be taking the stumps. They're still going to need to hire a removal service to remove the stumps.
Free dirt? I can't fathom any reason I would need Havasu dirt but I'm sure someone out there could use it on their house or construction projects. Maybe it could even be turned into soil or something for farming. Who knows.