The old training ground was in el Paseo de la Castellana,the financial part of Madrid,wasn't land without so much value,in the middle of nowhere as
@SammyUnited_83 wrote before.
Anyway,It seems that this is "Madrid and Barsa did It before so everything is justifiable".
Now It's Barsa but tomorrow can be some Madrid player with a "low" clause before renewal,or in English teams players refusing to renew or demanding transfer requests.
And since United have the enemy in front of the door their position should be also critical with all this.
You see that every sponsor is valuable,even tinder. Big clubs,with history but without magical sponsors to balance the accounts