Whether or not there's something he could gain with the Sharks this year is debatable. However, there are things that could be lost if he's performing quite well with the Barracuda and he's buried down there very clearly just to slide the contract--trust being the main thing.
Players (not just Eklund, but his teammates, and agents, and players around the league eventually) would start to see the Sharks and the front office in a negative light: cheap, not caring about trying to win, not treating young players fairly. It could be a fine line--it all depends on how he plays in the AHL--but a bad team, one that needs to rebuild on many fronts and historically had difficulty attracting players from the outside, has no business making themselves appear Scrooge-like when it comes to these matters.