I have a service come twice a month. It runs me 75 for 2500 sq ft, but I've had them for 3 yrs.
Personally, I consider it am investment in my marriage and family. I don't have to worry about bathrooms, mopping, vacuuming stairs in a townhome, dusting baseboards/pictures or climbing to get cobwebs. I also have the time to spare on the weekends. Everyone around here has such awful commutes that weekends really is the only time to do anything. To me, the $150/mo just isn't worth messing up my quality of life.
I have a friend in a similar situation. Her DH refuses to consider a service. I told her to have someone come in while he's out of the house one day and see what he says. Her DH is a bit of a neat freak so when their house is in disarray, it bothers him mores than her. Maybe a couple less family dinners out or packing lunch will free up the funds?