I just had two acres behind my house done. Lots of trees taken out, re-dug a ditch, and hauled off a lot of debris. Cost me 7500 bucks. He had two 315C excavators, a D56 bulldozer, and a 299D skid steer with a mulching head going to town on this place. Got a lot of rain towards then end, so he wasn't able to grade it off like he wanted...gotta wait until it dries up.
I had BIG, straight, tall, pines on my lot. Good for light poles, lots of lumber, and even a few loads of pulp wood. Just depends on how much time and effort you want to put in to it. If it's worth your while to make some money, then find a one man show to haul the trees. My guy may have made a few bucks off my trees, but he had to handle the logs several times with the excavators, move them around, load them on his trucks, and then haul them to the saw mill. However, it was cheaper for me to let him deal with them because it was easier and faster for him to be able to push a whole tree over vs just digging stumps. I MIGHT could have made a few bucks from selling the trees, but it would have cost me more in machine time more than likely. So, take that in to account.