Not everyone starts his FM career with a top side with the financial means and facilities to crank out homegrown talent on a regular basis. In fact, some clubs are severely strapped for cash and cannot free funds to invest heavily in the development of talent. Just fielding a somewhat-decent first team squad takes up most of the available funds so developing your own talent isn’t really an option. How exactly do you improve a club like that? You let others develop the talents for you as if you were some sort of FM variant of the cuckoo.
You see, cuckoos are notorious tricksters, shortcutting the chores of parenthood by hiding its eggs in the nest of other birds, which wind up hatching and raising them. A similar strategy can be applied to FM if you know where to look, how to scout and what to look out for. You let other clubs develop talents only for you to snap them up and use them; the cuckoo transfer-market strategy.