Ok I can see where it would be a hardship for you. However, if your prices are lower on some things, then that means that amount would go farther. Also, is that for full time work, ie around 40 hours a week? If not, then work more
If it is, then perhaps you would be better suited studying for that degree or finding another hobby that isn't quite so expensive.
Don't get me wrong, I am not trying to make light of your situation, or be dismissive. I am saying that your situation doesn't change someone else's situation. The majority of their target audience can afford $15/month, so that's a reasonable amount to charge. svck to not be able to pay it, and I've been there. Even to the point I wasn't sure i could afford to attend a PnP game due to the gas money it would take etc. So when I say study > playing, I say that because it worked for me. It's also doesn't hurt to marry a woman who plans to make 6 figures one day. 
PS: Don't let your wife start teaching. They may decide to pass up being a Nurse *insert word involving knocking people out for surgery* which starts at around 96K/yr and decide to teach for living, which leads to wanting a doctorate which costs more than I make a year and does NOT pay 96K/yr. Just some friendly advice from someone who's been there. 