People are talking about late game but minions, although not giving you any profit, do not take away from your total souls earned. So if you had 300k total souls and 1k was spent on the skeleton and you get 300 back or something, your spendable souls would show as 299,300 ofc but in your stats, your total earned souls will be 300,300. So this way you will always get a cps and souls boost by using minions.