I must say, the BK ads about me being family were pretty enticing. But then mom started yelling at me just because I wanted to sleep at dads house. Ohanna means family. And family means no one gets left behind, BK.
Maybe make the recruitment price rise whe you buy more than 2 at a time. Say spies one and two are 50k each. Spy 3 would cost 100k, 4 would cost 150k etc up to spy 5 or 6 with IA.
This way there is still incentive to buy spies early and often, but its not game breaking if they are targeted.