@Harald-Mollenhauer
Hi there,
As long as something like club fund compensation is on, then managers will be able to spend Bossoins to cover the difference between the amount of club funds the manager has on hand and the amount of club funds needed to buy the player. And with the paying off timers, you could reel in scouted players a lot faster.
As to how they got those Bosscoins could be of several reasons. They bought them, received them through achievements or through the 'free Bosscoins page' to complete offers on the offerwall. Sometimes there is a double or triple Bosscoin reward for those offers, so that way you could earn a lot of Bosscoins aswell.