The price started at 7.5GCs per 3k officers and a further 7.5GCs if you want 10k soldiers. Those prices are now upto 7.6GCs.
In my opinion, they're massively expensive.
If you're a war player, why pay that amount when a good chunk would be killed in war.
If you're an econ player, you would need to invest the equivalent monthly cost of paying the salaries for a few hundred game years.
I bought 1 of each to experiment but I cannot see the point at the moment of any further purchases.