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There are no bad skills in the game! Everyone just has different preferences! For example, I don't understand people who choose diplomacy... I personally don't take it...
1. Units join you not only for money but also just like that.
2. Among those who join, there may be units of your faction.
3. You're playing as Stronghold, as I understand, so this is even more beneficial for you. Another hero follows you and collects the recruited creatures, and upon returning to the castle, exchanges them for resources.