"I have had up to 12 IPs at any one time and I never let any of them to two unemployed people with kids.
I'd bet you don't either."
You sure about that - there is nothing wrong with renting to the unemployed. The majority of my tenants are the unemployed and students. Just because someone has a job does not mean they are good tenants. In fact I make it my business to cater for the bottom end of the market as that is where the need is.