Am I reading this correctly (I really hope not)! You damaged a carbon wheel. A professional(?) bike repairer recommended you don't continue to use the wheel, presumably for safety reasons, so you tried to sell the wheel to someone else?????
EVEN if you told them of the damage and that using the wheel was at their own risk I think you are morally on very thin ice selling it to a third party. IMO if you disagree with the shop/professional opinion then you are welcome to continue using the wheel yourself, but other than that I suggest you cut it up with a saw and throw it in the bin.