First off forget about the money. That is what good ball players make nowadays. Not 1968 anymore. Crazy?, yes. Would I like to see every team on an even playing field ? sure. Your not paying so who cares.
They are still under the luxury tax.
Second why are you so against them trying to better themselves in the incredibly competitive division they are in. They have not even step foot on the field yet and already you are saying they blew it. Let them play the season out and then at the end of the year see what transpired and if it didn't work out then hey you got a legitimate gripe but to get so bent out of shape for something that hasn't even happened, actually playing a game, is nuts. Let it play out and see. I like the trade so far but I may be disgruntled by years end.Sometimes it is as important to keep him out of your competitions hands.
As far as developing your own players. Having a good farm system and developing young players there is as good for getting established players as it is for getting them on the field for the home team.