First and foremost: Don't feel guilty about this! I don't know about others, but if I had a friend who had a 10% discount at a store and offered to purchase a dress or something for me, I'd take her up on it. (I'd probably reimburse her for the cost of the dress over the lunch I'd take her out on)
The same thing works for these discounts on Park Hopper Passes. I'm sure you're bartering with babysitting services or something similar for the price of the discount. Regardless of the "target" audience of government employees, Disney knows that these tickets are being sold.
We're only talking a few dollars here, so please don't feel guilty about it! Have a good trip and I hope your husband finds a new job soon!