I don't think this is true - football clubs will nearly always try to at least recoup part of the transfer fee paid for a player. So whilst Ashley-Seal has been very disappointing they likely wont let him walk for nothing. Can't quite believe you wouldn't expect significant fees for Horsfall, McWilliams or Chuk!
Also I think people are overly critical of Sowerby, at times he played well. We should see improved versions of him, Mills, Rose etc. this year as they will likely know they underperformed and will want to put it right.
I wasn't very clear, I meant players that we should get rid of or who have had interest already.
No way I would want any of those you listed to leave, even if for a tidy sum!