Good bit of business by Palace to be honest... Dobbie scored some important goals to keep them in the playoffs last season when it looked like they might crumble... As the 850k buy clause was put in the loan contract you've gotta argue it paid off BIG TIME.
Whatever you want to say about the guy, he has some track record for being part of sides promoted from this division. And as already mentioned, for all the riches that the Premier League has bought Palace, £850k for a player who scored some important goals to get them towards all that money is nothing really.