Like the majority of professional footballers you mean? I guess it would also apply to the vast majority of us who are always looking for a better job!
The first part of your reply is unfortunately true. The second is, I think, less so. Most employees in the real world are not on fixed term contracts with no early release clause; instead, they are on permanent contracts with a notice clause. There's nothing underhand about handing in your notice and offering to serve it - that's perfectly honourable behaviour.