He can’t make money off them, though. Once they can reproduce how can he control the offspring or make money from them? He’s essentially gifting them a life of their own.
That’s before you consider the straightforward nature of producing them from a production line vs via sex: the fact that you can’t guarantee they will get pregnant, that you can’t then control what the offspring will be.
This is why, if that’s his plan, his reasoning can’t be money. If it’s something else then what is it? Is he destroying humans and getting them to pay? But, again, he doesn’t actually know how any of it will or even could work. Is Deckard a replicant? It seems that Leto’s character probably thinks he isn’t in which case he’ll need male humans who aren’t infertile to create these…whatever they will be? They won’t be pure replicants.
If Deckard is a replicant then he was pretty off hand about letting that crucial piece of the technology he needs out of his sight.
I realise we are meant to be exploring themes of what it means to be human but that doesn’t mean you get a free pass to not give good reasoning for things that happen.