Are devils worth 7 blood each?

[Huzurdaddi]

As a guy that's getting smacked around by devils pretty badly

I've been that guy a couple of times, LOL. So this time I wanted to be the guy on the other side. And yup it's not horribly hard. There is a small window, however, in which you can get stomped.

Although I don't know if the key to my opponents devil hordes is soul contracts (though I've been wondering about that).

I doubt he is summoning them. They are quite difficult to summon in quanity, the casting requirements are quite high.

60 slaves takes 10 turns to pay for itself.

Uhm, I think it's 9, like I posted.

Of course there is a window in which you can get busted. Like all investment stratgies. My question is why does this one take less time than all the others to pay off?