Honestly I don't expect much from Borussia Dortmund if they still behave like this (only making money from selling players). Even if there is a statement from them that they want achievement, I will laugh at that. What they need to do now is to improve the team first and not to be too greedy with profits.
Actually they have no intention of selling their star players, but any player whose name has been on the radar of big European teams will find it difficult to refuse requests and players will do anything to get out of the club, but the club certainly doesn't want to lose players for free, and they will hear all incoming offers.