For fast-trainers 1 position = approximately 50 green boxes, 1 SA = 40-50 green boxes.
Thus, if he buys 2 position fast-trainers, for 11 players like in the picture he will need (50+45)*11=approximately 1000 green boxes.
Every day you can get 35 green boxes free. So, you can get 1000 green boxes free for about 30 days, which is just one season.
So, you don't have to be "crazy" or "donate" to get such team. Just save green boxes for a season and then use them