Ok, I understand the trick.
Let's say I am a cheater. I take a second team. I sell or destroy all the players of that 2nd team. Then,GKO automatically gives me poor players at 100g/week.
Instead of paying maybe 40000g of weekly salary, I will only pay somethink like 1500g. This is around 700,000g gained in just a season. And finally I buy a 35 year old playet for 700,000g from my first team.
And if I am very greedy, I create a 3rd, 4th,...10th team and do the same. And gain millions of G each season.
Great...