But we know exactly what we buy in market or other shops, and even training hall gives us exactly result.
We can estimate how much current sword is broken, but can’t see that some guy doesn’t have leg?
So, gambling with mercs looks a bit bothering. Also it’s only one that can be abused with save-load.
As for me there are two options to make it fair – “hide all” and “show all”. In first option – you can’t see stars even after hiring, but can guess after few lvlups. In second option – you can see all parameters of merc, but must pay more for better guy.