No problem
Had an older gentlemen, nearly 80, that worked for me a few years back as a tile-setter. He saw how many pallets we had to dispose of and asked if he could have them for firewood. Sure thing I say. He came by the shop one saturday with a 6x10 trailer, extension cord, couple skilsaws, a few cheap blades and his wife. Well, within a couple hours he and his wife had filled that trailer to overflow, probably 50-60 pallets all cut up. I asked him about the nails and fasteners, he said that was why he had a few of the cheap blades on hand, he went through a couple cutting those pallets that day. He broomed the paved area he had worked at when he was done, could hardly tell he had been there. That trailer load lasted him well over a month, he came back twice over the winter to collect more pallets.
I figured he had a bit over a cord piled on the trailer each time, so maybe 4 cords total over the winter. His cost, a few hours, a handful of cheap blades and a bit of fuel for his truck pulling the trailer, I let him use my power for his sawing. He did say that the firebox needed cleaned a bit more often due to all the different species as well as the nails and fasteners but for nearly free wood he was happy as a clam. We both came out good since I didn't need to pay for disposing of those pallets.