I hear what you are saying, but He walked on GWS for money and to return to Melbourne for the biggest contract offered to a young player. If he walks again what would it be for?
There are so many factors in a decision though DRB. Limited opportunity at GWS may also have been a factor in Boyd's decision as well as a return to Melbourne (friends and family) as well as the money. Bev (I think) has indicated that he thinks 4-5 years in the one job is enough. Could a player also think that way? I think some could. A regular change of environment suits some people.
I limit loyalty to supporters and the club and I often think this whole expected loyalty angle from players is over played. They are paid professionals and the club is their working environment. It's up to the club to provide the best working environment possible for a) the players to flourish while they are there so both they and the club are successful and b) give them a reason to stay, want to stay, or at least not to leave.
Supporters stay with the club (loyalty) win, lose or draw regardless of what player is on the list regardless of their (the players) motivation for being there which may not always be transparent. All I ask of a player is that they practise kaizen and do their best while they play in our colours and if they eventually leave, they leave, notwithstanding the inevitable disappointment if a good one goes.
As for Boyd himself, I'm willing to concede 2 years of his 7 year contract to development. Of the remaining 5 years, a prelim and 4 grand finals (2 flags) with him as a central figure in the forward set up is a good return. More is a bonus. If he wants to leave after that I'm not bothered as he will have done his job.