Yes, I think it's more than one year old. The idea is to prevent excessive subsidies between alliance members.
Not in last GW3, but in the previous one, I did ask an alliance fellow member to raise the selling price of its A148s I was looking for. I could get them new at 14M(and needed more immediately), and got the used ones at 17M. He was finding no buyer at 13M, so was happy to raise the price. And the plane made me good use. Under 20M, that plane is a good buy.
Imagine an alliance member is having financial problems. You can sell him a Pilatus at 1M, and buy it back at 6M. Then, for 6M, you sell him an ATR you buy him back for 30M. Then, for
30M, you sell him an A320...... you did get my point. Now, the financial lever you have to help your buddy is far smaller. It still does exists, but it prevents abuses. I was little annoyed to pay the A148s more than he wanted, but I perfectly understand why.