We have several companies in our area that work that way too. Log disposal around here comes at a severe price, unless you have your own log dump. I don't, so chips are only $25 per load, and it is tacitly understood that we will hide a few logs under the chips.
Tandem axle grapple trucks get emptied at $125.00 per load, and that is at the cheapest dump price you can find. That, and they make you cut the logs down to 5' or less so that it will go into their drum chipper.
I wish I had enough business and hard working guys to buy a good grapple truck, but you need a lot of work to justify the additional expense. Bought a decent used unit once, and my idiots kept burning the clutch up. Slow times, had to sell it.
I am currently making payments on our new Bobcat A300, with lots of attachments. In case you are not familiar with them, they have BOTH skid steer, or 4-wheel steering, at the flip of a switch. Once you go 4-wheel, you never want to go back to skid steer. NO turf destruction, with our floatation tires on, we can go to the back yard and come out with 3,000 lb logs and load them on the truck. Not as nice as a grapple truck, but much more versatile, and it can go places a big truck can't.
Bobcat, for some reason, does not market the thing right, in my opinion. Sure, it doesn't tear up the ground, and the tires last longer, but...they don't even mention that it has twice the traction and digging power than the skid steer units. I guess it might make the rest of their product line look bad. I wouldn't be surprised if it couldn't occasionally out-dig a track unit.